#include <iostream>
#include <string>
using namespace std;
 
string suma_3(string a, string b) {
    while (a.size() < b.size()) a = "0" + a;
    while (b.size() < a.size()) b = "0" + b;
 
    int carry = 0;
    string result = "";
 
    for (int i = (int)a.size() - 1; i >= 0; i--) {
        int sum = (a[i] - '0') + (b[i] - '0') + carry;
        carry = sum / 3;
        sum %= 3;
        result = char(sum + '0') + result;
    }
    if (carry > 0) result = '1' + result;
 
    return result;
}
 
int main() {
	for (int i = 0; i< 50; i++){
    string a, b;
    cin >> a >> b;
    cout << suma_3(a, b) << "\n";
	}
}

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12021 12
102 102
2001 1
10 20