#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

inline bool f(string s) {
  int digsum = 0;
  for (char c : s) {
  	if (c == '3') return true;
  	digsum += c - '0';
  }
  return digsum % 3 == 0;
}

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  string s;
  cin >> s;
  while (f(s)) {
    if (s.contains('3')) {
      bool flg = false;
      rep(i, s.size()) {
        if (flg) s[i] = '9';
        if (s[i] == '3') s[i] = '2', flg = true;
      }
    }
    else {
      for (int i = s.size() - 1; i >= 0; --i) {
        if (s[i] == '0') {
          s[i] = '9';
        }
        else {
          s[i]--;
          break;
        }
      }
    }
  }
  cout << s << '\n';
  return 0;
}