https://www.youtube.com/watch?v=XxceY97NjEU

obmep.py

# OBMEP 2015 - 2ª Fase - Data

def sum_digit(number):
    result = 0
    while number:
        result, number = result + number % 10, number // 10
    return result


def reverse_number(number):
    result = 0
    while number > 0:
        result *= 10
        result += number % 10
        number //= 10
    return result


for number in range(10, 100):
    print((sum_digit(number - sum_digit(number)) + 4) * reverse_number((sum_digit(number - sum_digit(number)) + 4)) * 3)