#include<iostream>
using namespace std;
int main() {
    int height;
    cin>>height;
    if(height < 1 || height > 26) {
        cout<< "Invalid input" <<endl;
        return 0;
    }
        for(int i=1;i<=height;++i) {
            for(int j=0;j<1;++j){
                cout<<char('A'+j);
            }
        cout<<endl;
    }
    return 0;
}
}