#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep1(i, n) for (int i = 1; i < (int)(n + 1); i++)
using ll = long long;
using P = pair<int, int>;
using Graph = vector<vector<int>>;

int main(){
    string s;
    cin >> s;
    int t = s.size();
    if(s[t-1] == '1'){
        s[t-1] = '0';
    }
    else{
        s[t-1] = '1'; 
    }
    cout << s <<endl;
}