I have a pretty simple coding function that returns all possible substrings of a string including the string itself

def main():
    str = raw_input ("Enter first string: ")
    size = len(str)
    for sub_len in range (1, size + 1):
      for idx in range (0, size - sub_len + 1):
        sub_str = str[idx : idx + sub_len]
        print sub_str
          
main()

the current output looks like this for the string 'abcd'
a
b
c
d
ab
bc
cd
abc
bcd
abcd

my question is, how can i get the program to print the substrings in the opposite order in terms of length? i.e.:

abcd
abc
bcd
ab
bc
cd
a
b
c
d

My quick hack of your code gives

seems to work

I do not Have A.D.D. im just easily, Hey look a Squirrel!