#include <stdio.h>

unsigned len(const char *string)
{
	unsigned count = 0;
	for(;string[count] != '\0'; ++count);
	return count;
}

int main(void) {
	printf("%d\n", len("grzegorz"));
	printf("%d\n", len(""));
	printf("%d\n", len("x"));
	printf("%d\n", len("xx"));
	return 0;
}