#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
using namespace std;

int main(){
    string s, x;
    cin >> s;
    x = s[s.size()-1];
    s.pop_back();
    cout << s;
    if(x == "1") cout << "0" << endl;
    else cout << "1" << endl;
}