num_rows = int(input())
num_cols = int(input())

# Note 1: You will need to declare more variables
# Note 2: Place end=' ' at the end of your print statement to separate seats by spaces

for row_num in range(1, num_rows + 1):
    for col_char in map(chr, range(ord('A'), ord('A') + num_cols)):
        print('{0}{1}'.format(row_num, col_char), end=' ')

print()