#include <stdio.h>
#include <stdlib.h>
void main()
{
int m, n, i, j;
scanf_s("%d%d", &m, &n);
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
putchar('A' + abs(i - j));
putchar('\n');
}
system("pause");
}
