#include <iostream>
using namespace std;
int main() {
    int n,m; 
    cin >> n>>m;
    char a='A';
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <=m ; j++) {
    		cout<<(char)(a+j-1);
    		
    	}
		a++;
    	cout<<endl;
    }
    return 0;
}