#include<bits/stdc++.h>
using namespace std;
using LL = long long;
void solve()
{
	string s; cin >> s;
	int n = s.size();
	if(s.size() == 1)
	{
		cout << (s[0] == '1' ? 0 : 1) << "\n";
		return ;
	}
	else cout << s.substr(0,n - 1);
	cout << (s[0] == '1' ? 0 : 1) << "\n";
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int t; t = 1;
	while(t --)
	solve();
	return 0;
}