#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
using ll = long long;

int main(void){
  string s; cin >> s;
  int n=s.size();
  vector<string> ans(2);
  int r=-1;
  for(int i=0; i<n; i++){
    if(s[i]<'4'){
      r=i; break;
    }
  }
  string pre, aft;
  for(int i=r+1; i<n; i++) aft+=(r==-1?min(s[i], '5'):'5');
  if(r!=-1){
    pre+='5';
    bool ok=false;
    for(int i=r-1; i>=0; i--){
      if(ok||s[i]=='4') pre+=s[i];
      else{
        pre+='4';
        ok=true;
      }
    }
    if(!ok) pre.pop_back();
    reverse(begin(pre), end(pre));
  }
  cout << pre+aft << endl;
  return 0; 
}