listing_2_5.c

#include <stdio.h>

int any(char s1[], char s2[])
{
	int i,j;
	for (i = 0; s1[i] != '\0'; i++) {
		for (j = 0; s2[j] != '\0'; j++) {
			if (s1[i] == s2[j])
				return i;
		}
	}
	return -1;
}