#include <bits/stdc++.h>   using namespace std;   int main() {     int N, i;     cin >> N;     char ch;     int o = 0, n = 0, e = 0, z = 0, r = 0;     for (i = 0; i < N; i++) {       cin >> ch;       if (ch ==  o )         o++;       else if (ch ==  n )         n++;       else if (ch ==  e )         e++;       else if (ch ==  z )         z++;       else         r++;     }     int m1, m2;     m1 = min(o, min(n, e));     o -= m1;     e -= m1;     while (m1--) cout <<  1  ;     m2 = min(z, min(e, min(r, o)));     while (m2--) cout <<  0  ;     return 0;   }   