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

ll INF=2e18;


int main() {
    string S;cin>>S;
    if(S.back()=='0') S.back()='1';
    else S.back()='0';
    cout<<S<<endl;
    
}