#include <iostream>
#include <vector>

using namespace std;

vector<string> bin{"0", "1", "10", "11", "100"};

int main() {
    string s, t;
    cin >> s >> t;

    bool x = true, y = true;
    if (s[0] == '-')x = false, s = s.substr(1, s.size() - 1);
    if (t[0] == '-')x = false, t = t.substr(1, t.size() - 1);

    int a = -1, b = -1;
    for (int i = 0; i < bin.size(); i++) {
        if (s == bin[i])a = i;
        if (t == bin[i])b = i;
    }

    int ret = (x ? a : -a) + (y ? b : -b);
    if (ret < 0)cout << "-";
    cout << bin[abs(ret)] << endl;
    return 0;
}