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#include<stdio.h>
#include<string.h>
void main()
{
char s1[100],s2[100],x[2],s[100];
int i,l1,l2,sml,j,k;
scanf("%s %s",s1,s2);
l1=strlen(s1);
l2=strlen(s2);
if(l1<l2)
{
sml=l1;
}
else
{
sml=l2;
}
for(i=0;i<sml;i++)
{
for(j=0;j<sml;j++)
{
if(s2[i]==s1[j])
{
x[0]=s2[i];
for(k=0;k<sml;k++)
{
if(x[0]==s[k])
return;
else
{
s[i]=x[0];
printf("%c",s[i]);
return;
}
}
}
}
}
}