AC

#include <iostream>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);

int n, m;

cin >> n >> m;


for (int i = 0; i < n; ++i) {
   
    for (int j = 0; j < m; ++j) {
        
        cout << (char)('a' + j);
    }
    cout << endl;
}

return 0;

}