Допоможіть будь ласка

day_of_week = ["Monday","Tuesday",

              "Wednesday","Thursday",

              "Friday", "Saturday",

              "Sunday"]

with open("input.txt") as f:

   num = int(f.readline())

message = ""

if num >= 1 and num <= 7:

   message = day_of_week[num-1]

else:

   message = "Error"

with open("output.txt", "w") as f:

   print(message, file=f)