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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