for i in range(10, 100):
    if i % 10 == 0:
        continue
    row = []
    for j in range(2, 10):
        if str(i * j)[-2] == '0':
            row.append(f'{i} * {j} = {i * j}')
    if len(row) > 0:
        print(f'{i}: ' + ', '.join(row))