#include <iostream>
using namespace std;
int main()
{
int n;
cin>>n;
for(int i=0; i<n-1; i++)
cout<<"ABCDEFGHIJKLMNOPQRSTUVWXYZ"<<endl;
for(int i=0; i<n-1; i++)
cout<<"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
return 0;
}
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