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

int main(int argc, char **argv)
{
    if (argc != 3) {
	fprintf(stderr, "usage: %s string1 string2\n", argv[0]);
	return(1);
    }

    if (strstr(argv[1], argv[2]))
	printf("Yes, the second argument is a substring of the first.\n");
    else
	printf("No, the second argument is not a substring of the first.\n");

    return(0);
}