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