#include <iostream>
using namespace std;

int main() {
    int x;    //rows
    cin>>x;
    
    for (int i=1; i<=x; i++){          //columns 
        for(int j=1; j<=i; j++){       //rows
            //2nd loop decide  rows 
           if(i%2==0){
               cout<<(char)(j+64)<<" ";
           }
               else { cout<<j<<" ";
                    }
           }
         cout<<endl; 
        }
        
        
       
    }