array = [5,4,3,1]

 for i in array:
     print(i)

 largest = None
 smallest = None
 while True:
     num = input("Enter a number: ")
     if num == "done" : break　　　　if len(num) < 1 : break    # check for empty line
     try:
         num = int(num)
     except:
         print("Invalid input")
         continue
     if largest is None:
         largest = num
     if smallest is None:
         smallest = num
     if num > largest:
         largest = num
     if num < smallest:
         smallest = num

 print("Maximum is " + str(largest))
 print("Minimum is " + str(smallest))