#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pii=pair<int,int>;

#define all(a) a.begin(),a.end()
#define pb push_back
#define sz(a) ((int)a.size())

signed main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    string s; cin >> s;
    s.back()^=1;
    cout << s << "\n";
}