#include <stdio.h>
#include <string.h>
void func(char *b)
{
	char *a= b + 1;
	printf("input = %s\n", b);
	while (*a)
	{
		if ((strlen(a)%(int)(a - b)) == 0 && strncmp(a, b, strlen(a)) == 0)
		{
			printf("repeat = %.*s\n\n", (int)(a - b), b);
			return;
		}
		++a;
	}
	printf("repeat unit not found!\n");
	return;
}
int main()
{
	func("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
	func("123412312341231234123123412312341231234123");
	func("oxoxoxoxoxoxoxoxxoxoxoxoxoxoxoxoxx");
	func("axaxa");
	return 0;
}