#include <bits/stdc++.h>
using namespace std;
int main()
{
int n; cin >> n;
string s; cin >> s;
int x = count(s.begin(), s.end(), '0');
if (x * 2 > n){
while(x--) cout << 0;
}else{
x = n - x;
while(x--) cout << 1;
}
return 0;
}
