#include <bits/stdc++.h>

using namespace std;

int main() {
    // freopen("in", "r", stdin);
    // freopen("out", "w", stdout);

    long long a, b;
    while (1) {
        cin >> a >> b;
        if (a == 0) break;
        long long c = a + b;
        string str = to_string(c);
        for (int i = 0; i < str.length(); i++) {
            if (str[i] != '0') cout << str[i];
        }
        cout << endl;
    }

    return 0;
}