#include <iostream>
#include <iomanip>
#include <stack>
#include <queue>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <deque>
#include <set>
#include <map>
#include <bitset>
#include <atcoder/all>
#define rep(i,n) for(int i = 0; i < n; i++)

using namespace std;
using namespace atcoder;
using ll = long long;

int main() {
	string s;
	cin >> s;
	
	int l = s.size() - 1;
	if (s[l] == '1') s[l] = '0';
	else s[l] = '1';

	cout << s << endl;
}