diff --git a/.gitignore b/.gitignore
index 36d9195..08d271e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 average
+convert_to_ints
 *.swp
diff --git a/Makefile b/Makefile
index a25cfff..1bf8066 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,12 @@
-all: average
+all: average convert_to_ints
 
 average: average.c cmaybe.h
 	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $<
 
+convert_to_ints: convert_to_ints.c cmaybe.h
+	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $<
+
 clean:
-	rm -f average
+	rm -f average convert_to_ints
 
 .PHONY: all clean
diff --git a/cmaybe.h b/cmaybe.h
index bdfb824..0a82c15 100644
--- a/cmaybe.h
+++ b/cmaybe.h
@@ -15,8 +15,89 @@
 	return __return_value;\
 }
 
-#define IS_VALUE(x) if((x).is_value)
-#define IS_NOT_VALUE(x) if(!(x).is_value)
+#define IS_VALUE(x) if ((x).is_value)
+#define IS_NOT_VALUE(x) if (!(x).is_value)
 #define VALUE(x) (x).value
 
+struct __free_list {
+	struct __free_list *next;
+	void *ptr;
+};
+#define ENABLE_TRY() \
+	struct __free_list *__allocations = NULL, *__free_list_node;\
+	void *__allocation, *__old_allocation;\
+	jmp_buf __try_fail_jmp_buf;\
+	if (setjmp(__try_fail_jmp_buf)) {\
+		TRY_FREE_ALL();\
+		RETURN_NOTHING();\
+	}
+#define TRY_TYPE(name) MAYBE(name) __try_tmp_##name
+#define TRY(name, maybe_value) (\
+	__try_tmp_##name = maybe_value,\
+	(__try_tmp_##name.is_value ? 0 :\
+		longjmp(__try_fail_jmp_buf, 1)\
+	),\
+	__try_tmp_##name.value\
+)
+
+#define TRY_MEMALLOC(allocator, ...) (\
+	__free_list_node = malloc(sizeof(struct __free_list)),\
+	(__free_list_node == NULL ? longjmp(__try_fail_jmp_buf, 1) : 0),\
+	__allocation = allocator(__VA_ARGS__),\
+	(__allocation == NULL ? (\
+		free(__free_list_node),\
+		longjmp(__try_fail_jmp_buf, 1)\
+	) : (\
+		__free_list_node->next = __allocations,\
+		__free_list_node->ptr = __allocation,\
+		__allocations = __free_list_node\
+	)),\
+	__allocation\
+)
+#define TRY_MALLOC(size) TRY_MEMALLOC(malloc, size)
+
+static void __remove_free_list(struct __free_list **head, void *ptr) {
+	struct __free_list **current = head;
+	while (*current != NULL) {
+		if (current[0]->ptr == ptr) {
+			*current = current[0]->next;
+			break;
+		}
+		current = &current[0]->next;
+	}
+}
+#define TRY_FREE(allocation) (\
+	free(allocation),\
+	__remove_free_list(&__allocations, allocation)\
+)
+#define TRY_FREE_ALL() \
+	while (__allocations != NULL) {\
+		struct __free_list *current = __allocations;\
+		free(current->ptr);\
+		__allocations = current->next;\
+		free(current);\
+	}
+
+static void __replace_free_list(struct __free_list **head, void *from, void *to) {
+	struct __free_list **current = head;
+	while (*current != NULL) {
+		if (current[0]->ptr == from) {
+			current[0]->ptr = to;
+			break;
+		}
+		current = &current[0]->next;
+	}
+}
+#define TRY_MEMREALLOC(reallocator, old, ...) (\
+	__old_allocation = old,\
+	__allocation = reallocator(old, __VA_ARGS__),\
+	(__allocation == NULL ? (\
+		longjmp(__try_fail_jmp_buf, 1)\
+	) : \
+		__replace_free_list(&__allocations, __old_allocation, __allocation)\
+	),\
+	__allocation\
+)
+#define TRY_REALLOC(old, size) TRY_MEMREALLOC(realloc, old, size)
+
 #endif
diff --git a/convert_to_ints.c b/convert_to_ints.c
new file mode 100644
index 0000000..2094d56
--- /dev/null
+++ b/convert_to_ints.c
@@ -0,0 +1,110 @@
+#define _POSIX_C_SOURCE 200809L
+#include <inttypes.h>
+#include <setjmp.h>
+#include <string.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "cmaybe.h"
+
+MAYBE_TYPE(voidptr, void *);
+
+MAYBE(voidptr) strchr_maybe(const void *s, int c) {
+	ENABLE_RETURN(voidptr);
+	void *location = strchr(s, c);
+	if (location == NULL) {
+		RETURN_NOTHING();
+	} else {
+		RETURN_VALUE(location);
+	}
+}
+
+MAYBE_TYPE(intmax_t, intmax_t);
+
+MAYBE(intmax_t) str2int(const char *string) {
+	ENABLE_RETURN(intmax_t);
+	char *endptr;
+	intmax_t num = strtoimax(string, &endptr, 10);
+
+	if (*endptr == '\0' && string[0] != '\0') {
+		RETURN_VALUE(num);
+	} else {
+		RETURN_NOTHING();
+	}
+}
+
+struct intmax_t_array {
+	intmax_t *data;
+	size_t length;
+	size_t alloc_size;
+};
+
+MAYBE_TYPE(intmax_t_array, struct intmax_t_array);
+
+MAYBE(intmax_t_array) convert_to_numbers(char *line) {
+	ENABLE_RETURN(intmax_t_array);
+	ENABLE_TRY();
+	TRY_TYPE(intmax_t);
+
+	struct intmax_t_array numbers;
+	numbers.length = 0;
+	numbers.alloc_size = 64 * sizeof(intmax_t);
+	numbers.data = TRY_MALLOC(numbers.alloc_size * sizeof(intmax_t));
+
+	char *strtok_saveptr = NULL;
+	for (;;) {
+		char *num_str;
+		if (strtok_saveptr == NULL) {
+			num_str = strtok_r(line, " ", &strtok_saveptr);
+		} else {
+			num_str = strtok_r(NULL, " ", &strtok_saveptr);
+		}
+
+		if (num_str == NULL) {
+			break;
+		}
+
+		intmax_t num = TRY(intmax_t, str2int(num_str));
+
+		size_t index = numbers.length;
+		numbers.length++;
+		if(numbers.alloc_size / sizeof(intmax_t) < numbers.length) {
+			if(SIZE_MAX / 2 < numbers.alloc_size) {
+				TRY_FREE(numbers.data);
+				RETURN_NOTHING();
+			}
+			numbers.alloc_size *= 2;
+			numbers.data = TRY_REALLOC(numbers.data, numbers.alloc_size);
+		}
+		numbers.data[index] = num;
+	}
+
+	RETURN_VALUE(numbers);
+}
+
+int main(void) {
+	size_t line_size = 0;
+	char *line = NULL;
+
+	ssize_t line_len;
+	while ((line_len = getline(&line, &line_size, stdin)) > 0) {
+		MAYBE(voidptr) newline = strchr_maybe(line, '\n');
+		IS_VALUE(newline) {
+			*(char*)VALUE(newline) = '\0';
+		}
+
+		MAYBE(intmax_t_array) numbers = convert_to_numbers(line);
+		IS_VALUE(numbers) {
+			for (size_t i = 0; i < VALUE(numbers).length; i++) {
+				printf("%jd ", VALUE(numbers).data[i]);
+			}
+			printf("\n");
+		} else {
+			printf("Error in conversion\n");
+		}
+	}
+
+	return 0;
+}