#include <iostream>

using namespace std;

int main() {

    string a, b;

    int da, db, pa = 0, pb = 0;

    cin >> a >> da >> b >> db;

    for (int i = 0; i < a.length(); i++)

        if (da == (a[i] - '0')) pa = pa * 10 + da;

    for (int i = 0; i < b.length(); i++)

        if (db == (b[i] - '0')) pb = pb * 10 + db;

    cout << pa + pb;

    return 0;

}