#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

string solve(string s) {
  int n = s.size();
  int l = -1, r = n + 1;
  while (r - l > 1) {
    int c = (l + r) / 2;
    string t;
    rep(i, c) {
      int x = s[i] - '0';
      t += '0' + clamp(x, 4, 5);
    }
    t.insert(t.end(), n - c, '4');
    (t <= s ? l : r) = c;
  }
  if (l == -1) {
    return string(n-1, '5');
  }
  string t;
  bool small = false;
  rep(i, n) {
    if (small) {
      t += '5';
      continue;
    }
    if (i < l) {
      int x = s[i] - '0';
      t += '0' + clamp(x, 4, 5);
      small |= x > 5;
    } else if (i == l) {
      t += !small ? '4' : '5';
    } else {
      t += '5';
    }
  }
  return t;
}

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  string s;
  cin >> s;
  cout << solve(s) << '\n';
}