#include <bits/stdc++.h>

using namespace std;

int main() {
    string S;
    cin >> S;
    int N = (int)(S.size());
    if (S[N - 1] == '0') {
        S[N - 1] = '1';
    } else {
        S[N - 1] = '0';
    }
    cout << S << endl;
    return 0;
}