#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)

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