#include <iostream>
using namespace std;

int main() {
	// your code goes here
	int n;
    cin>>n;
    char c='A';
    for(int i=0;i<n;i++) {
        for(int j=0;j<=i;j++) {
                cout<<c;
                cout<<" ";
                c++;
        } 
        cout<<endl;
    }
	return 0;
}