#include <stdio.h>
 
int main(void) {
	/*int n;
    printf("Enter the columns: \n");
    scanf("%d",&n);*/
    int m;
    printf("Enter the rows: \n");
    scanf("%d",&m);
 
    for(int i=1;i<=m;i++){
         int a=65;
         int d=1;  
        for(int j=1;j<=i;j++){
              if(i%2==0){
                 char ch=(char)a;  
                 printf("%c ",ch);
                 a++;
              }
             else{
                printf("%d ",d);
             }   d++;
 
         }
         printf("\n");
 
    }
 
 
	return 0;
}
 

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