View Code of Problem 22

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

int main(void)
{
    char s1[1001],s2[1001];
    while(scanf("%s",s1) != EOF)
    {
        scanf("%s",s2);
        int i,j,arr[27] = {0},len1 = strlen(s1),len2 = strlen(s2);
        for(i = 0;i < len1;i++)
        {
            if(arr[s1[i] - 'a' + 0] == 0)
                arr[s1[i] - 'a' + 0]++;
        }
        for(j = 0;j < len2;j++)
        {
            if(arr[s2[j] -'a' + 0] == 1)
                arr[s2[j] -'a' + 0]++;
        }
        for(i = 0;i < 27;i++)
        {
            if(arr[i] == 2)
                printf("%c",i + 'a');
        }
        printf("\n");
    }

}