#include <bits/stdc++.h>

using namespace std;
const int N = 1e5 + 10;
char a[N];

int main() {
    freopen("reverse.in", "r", stdin);
    freopen("reverse.out", "w", stdout);

    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];

    for (int i = 0; i < n; i++)
        if (i % 2 == 0)
            cout << !(a[i] - '0');
        else
            cout << a[i];

    return 0;
}