//#pragma GCC optimize("Ofast,unroll-loops") // let the chaos begin!
//#pragma GCC target("avx,avx2,fma,tune=native")
//#pragma GCC comment(linker, "/stack:200000000")
#include <bits/stdc++.h>

using namespace std;

#define int int64_t
#define fi first
#define se second
mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());

const int N = 2e5 + 5;

void solve(){
    string s;
    cin >> s;
    if(s.size() == 1){
        cout << s << '\n';
    }
    else cout << s.substr(0,s.size() - 1) << (s[s.size() - 1] == '1' ? '0' : '1');
}


int32_t main()
{
    #ifdef LOCAL
        freopen ("input.txt", "r", stdin);
        freopen ("output.txt", "w", stdout);
    #endif //LOCAL
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int qq = 1;
//    cin >> qq;
    while(qq--){
        solve();
    }
    return 0;
}