func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = acos(-1);   const double eps = 1e-9;   const int inf = 2000000000;   const long long infLL = 9000000000000000000;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     int n;     cin >> n;     string second;     cin >> second;     int c = 0, d = 0;     for (auto u : second) {       if (u ==  n )         c++;       else if (u ==  z )         d++;     }     while (c--) cout << 1 <<    ;     while (d--) cout << 0 <<    ;     cout <<   n ;     return 0;   }   