#include <bits/stdc++.h>
#define int long long
#define pb push_back

using namespace std;

main() {
	string a, b;
	cin >> a >> b;
	reverse(a.begin(), a.end());
	reverse(b.begin(), b.end());
	while(a.size() < b.size()) {
		a.push_back('0');
	}
	while(b.size() < a.size()) {
		b.push_back('0');
	}
	a.push_back('0');
	b.push_back('0');
	int rest = 0;
	for(int i = 0; i < a.size(); i++) {
		if(a[i] == '1' && b[i] == '1' || (b[i] == '1' && rest == 1) || (a[i] == '1' && rest == 1)) {
			b[i] = '0';
			rest = 1;
			continue;
		}
		if(a[i] == '1' && b[i] == '1' && rest == 1) {
			b[i] = '1';
			rest = 1;
			continue;
		}
		b[i] += (a[i] - '0' + rest);
	}
	reverse(b.begin(), b.end());
	int pos = 0;
	while(b[pos] == '0' && pos < b.size() - 1) {
		b[pos++] = '#';
	}
	for(int i = 0; i < b.size(); i++) {
		if(b[i] != '#') cout << b[i];
	}
}