#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,a,b) for(int i = a; i < b; ++i)
#define rrep(i,a,b) for(int i = a; i >= b; --i)
#define all(x) (x).begin(),(x).end()

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

  cout << s << endl;
  
  return 0;
}