#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	char zimu = 'A';
	for (int i = 0;i < n;i++)
	{
		for (int j = 0;j < n;j++)
		{
			char M = zimu + j + i;
			while (M > 'Z')
			{
				M -= 26;
			}
			printf("%c", M);
		}
		printf("\n");
	}
	return 0;
}