#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
using namespace atcoder;

typedef modint998244353 mint;
typedef long long ll;

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