#include <bits/stdc++.h>
using namespace std;

int main(){
    string S, T;
    cin >> S;
    int N = S.size();

    int l = -1;
    for (int i = 0; i < N; i++){
        if (S[i] >= '6'){
            for (int j = i; j < N; j++) T.push_back('5');
            break;
        }
        else if (S[i] <= '3'){
            if (l == -1){
                T.clear();
                for (int i = 0; i < N-1; i++) T.push_back('5');
            }
            else{
                T[l] = '4';
                for (int j = l+1; j < i; j++) T[j] = '5';
                for (int j = i; j < N; j++) T.push_back('5');
            }
            break;
        }
        else{
            T.push_back(S[i]);
            if (S[i] == '5') l = i;
        }
    }

    cout << T << endl;
}