int main()
{
 int col, row;
 cin >> col >> row;

 for (int i=1; i<=row; i++)
 {

     for (int j=1; j<=col; j++)
     {
         switch(j)
     {
         case 1: cout << 'A';
         break;
         case 2: cout << 'B';
         break;
         case 3: cout << 'C';
         break;
         case 4: cout << 'D';
         break;
         cout << j;
     }
     cout << i << " ";
     }
     cout <<"\n";
 }
}