#include <iostream>
#include <string>
using namespace std;

int main() {
    string result = "10101";
    reverse(result.begin(),result.end());
    cout << result;
}
    
    int i = a.size() - 1, j = b.size() - 1, carry = 0;
    string result = "";
    
    while (i >= 0 || j >= 0 || carry) {
        int bitA = (i >= 0) ? a[i--] - '0' : 0;
        int bitB = (j >= 0) ? b[j--] - '0' : 0;
        int sum = bitA + bitB + carry;
        result.push_back((sum % 2) + '0');
        carry = sum / 2; 
    }
    
    reverse(result.begin(),result.end());
    cout << result;
    
    return 0;
}