#include<iostream>
using namespace std;
int main(){
char a[1001],b[1001],c[26];
int d;
cin>>a>>b;
for(int i=0; i<26; i++){c[i]=0;}
for(int i=0; a[i]!='\0'; i++){
d=(a[i]+b[i])%65;
c[d]+=1;}
cout<<c;
return 0;
}
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