''' Purpose: produce and print the reverse of a user-supplied word
    (using accummulation)
'''


### get word
reply = input( "Enter word: " )

word  = reply.strip()

### get a copy of the word through accumulation

# Accumulator Format:
# accumulator = ... # string, number, or list (depending on what we
# wanna build).
# Initialize accumulator to '' for string, 0 for sum/difference
# and 1 for mult/division, and [] for list
# for ... in sequence:
    # Update Accumulator looks like:
    # accumulator modification (accumulator = accumulator + modification)
# I will be sending out an accumulator review in a few days!

reversed = '' # Initialize accumulator (we will build this up)
for ch in word : # word is an existing string (sequence) of characters
    #reversed = reversed + ch
    # print('when loop action continues ch =', ch, 'and reversed =', reversed)
    reversed = ch + reversed
    print( reversed ) # prints out the new version of reversed
    # each time we run through the loop

# We started reversed off as an empty string '' and
# if we have reversed = reversed + ch then
# we gradually add each character to the accumulator ch
# it will be '' then 'a' then 'ab' then 'abc' and build up 'abc'

# reversed = ch + reversed will add the new character to
# the front of each original value of reversed
# Now, we will have '' then 'a' then 'ba' the 'cba'

### print reverse
print( reversed )