#include <bits/stdc++.h>
using namespace std;
int n;
int cnt[3], seen[3];
string s;
int main() {
  ios::sync_with_stdio(0);
  cin >> n >> s;
  int m = n / 3;
  for (int i = 0; i < n; i++) {
    cnt[s[i] - '0']++;
  }
  for (int i = 0; i < n; i++) {
    if (cnt[s[i] - '0'] > m) {
      for (long long j = 0; j < 3; j++) {
        if (cnt[j] < m) {
          if (j > s[i] - '0' && seen[s[i] - '0'] < m) break;
          cnt[j]++;
          cnt[s[i] - '0']--;
          s[i] = j + '0';
        }
      }
    }
    seen[s[i] - '0']++;
  }
  cout << s << endl;
  return 0;
}
