#include <iostream>

using namespace std;

int main()
{
    unsigned int n;
    int i, j;
    char c, d;
    cin>>n>>c>>d;
    for(i=1;i<=n;i++){
        if (i%2==1){for(j=1;j<=n;j++){
                        if(j%2==1) cout<<c;
                        else cout<<d;}
        }
        else if (i%2==0){for(int k=1;k<=n;k++){
                         if(k%2==1) cout<<d;
                         else cout<<c;}
        }
        cout<<endl;}
        return 0;
}