output_description: Output what day of the week it is in a line. Use the following conventions in
  your output: "mon" for Monday, "tue" for Tuesday, "wed" for Wednesday, "thu"
  for Thursday, "fri" for Friday, "sat" for Saturday, and "sun" for Sunday.
input_description: The input is given in the following format.
  
      
      
      X
      
  
  The input line specifies a day X (1 ≤ X ≤ 30) in September 2017.
attempt: day = ["sat", "sun", "mon", "tue", "wed", "thu", "fri"]
  dayf = ["thu", "fri", "sat", "sun", "mon", "tue", "wed"]
  x = int(input())
  if x < 9:
      print(dayf[x % 7])
  else:
      print(day[abs(x - 9) % 7])
  
problem_description: Day of Week
  
  The 9th day of September 2017 is Saturday. Then, what day of the week is the
  X-th of September 2017?
  
  Given a day in September 2017, write a program to report what day of the week
  it is.
samples: [{"input": "1", "output": "fri"}, {"input": "9", "output": "sat"}, {"input": "30", "output": "sat"}]