На, с тебя 20 рублей
week = {
"1": "MONDAY",
"2": "TUESDAY",
"3": "WENDSDAY",
"4": "THURSDAY",
"5": "FRIDAY",
"6": "SATURDAY",
"7": "SUNDAY"
}
num = input("Введите номер дня недели: ")
if num in week:
print(week[num])
else:
print("Неверный номер дня недели")