#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int n, m;
cin >> n >> m;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
{
cout << char('A' + abs(i - j));
}
cout << endl;
}
return 0;
}