#include <stdio.h>
#include <string.h>

const char s1[] = "AAA \0\0\0\0\0";
const char s2[] = "BBB";
int main()
{
	char *s3 = strcat(s1, s2);
	printf(" %s \n %s \n %s\n", s1, s2, s3);
	return 0;
}