#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;


int main() {
    string cipher, hex, res;
    cin >> cipher;
    cin >> hex;
    
    int idx = 0;
    for(int i=0; i<(int)hex.size(); i+=2){
        int key = stoi(hex.substr(i,2), nullptr, 16);
        res.push_back(cipher[idx] ^ key);
        idx = (idx + 1) % (int)(cipher.size());
    }
    
    cout << res << endl;
    
    return 0;
}