Python notes: 字母找字串

隨機抽選個題目來做，結果花了我超久的時間哈哈哈哈
題目: 请输入星期几的第一个字母来判断一下是星期几，如果第一个字母一样，则继续判断第二个字母。
http://www.runoob.com/python/python-exercise-example31.html


My code:

print ("Key in letter to search week day\n")

i=0

weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Satursday"]

while len(weekdays)>1:
  user_input = input("Input:")
  j=len(weekdays)-1

  while j>=0:
    #print (weekdays[j][i])
    if (weekdays[j][i] != user_input):
      weekdays.pop(j)
    j=j-1
  i = i+1

print (weekdays)