[프로그래머스] 2016년 - Python

def solution(a, b):
    answer = ''
    month = ['FRI', 'SAT', 'SUN', 'MON', 'TUE', 'WED', 'THU']
    lastDays = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    answer = month[(sum(lastDays[:a - 1]) + b - 1) % 7]

    return answer