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