7891

#include <bits/stdc++.h>
using namespace std;
int main() {
string s1, s2;
int n;
cin >> n;
cin >> s1 >> s2;
for (int i = 1; i < n; i ++ ) {
if (i % 2 == 1) {
swap(s1[i], s2[i]);
}
}
cout << s2;
return 0;
}