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#include<stdio.h>
#include<string.h>
int main()
{
int count=0;
char str1,str2;
char *a[5],*b[5];
a[5]=&str1;
b[5]=&str2;
scanf("%s%s",&str1,&str2);
char i,j;
for(i=0;i<=4;i++)
{
str1=*a[i];
}
for(j=0;j<=4;j++)
{
str2=*b[j];
}
for(i=0;i<=4;i++)
{
for(j=0;j<=4;j++)
{
count=0;
if(*a[i]!=*b[j])
{
count++;
break;
}
}
}
if(count==0)
{
printf("%c",*a[i]);
}
return 0;
}