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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
 
    string s; cin >> s;
    string answer;
    bool end = false;
    auto dfs = [&](auto dfs,int pos,bool same) -> void {
        if(pos == s.size()){end = true; return;}
        if(!same){answer += '5',dfs(dfs,pos+1,same); return;}

        if(s.at(pos) > '5'){answer += '5',dfs(dfs,pos+1,false); return;}
        else if(s.at(pos) == '5'){
            answer += '5';
            dfs(dfs,pos+1,true);
            if(end) return;
            answer.pop_back(),answer += '4';
            dfs(dfs,pos+1,false); return;
        }
        else if(s.at(pos) >= '4'){
            answer += '4';
            dfs(dfs,pos+1,true);
            if(end) return;
            answer.pop_back();
            if(pos == 0) dfs(dfs,pos+1,false);
        }
        else if(pos == 0) dfs(dfs,pos+1,false);
    };
    dfs(dfs,0,true);
    cout << answer << endl;
}