rev_string

#Create an empty list to store the letters of the string
letters = []

#Define a function that collects the letters of a string and appends them into a list
def collect_string():
  word = input("word to reverse:")
  for i in word:
    letters.append(i)
  return letters

#Create an empty list to store each letter from last to first
def rev_string(string):
  rev = []
  size = len(letters)
  for i in letters:
    if size > 0:
      rev.append(letters[size-1])
      size -= 1

  #at the end of the function, use the join method to concatenate the reversed list back into a string; "" specifies no gaps between list items
  back = "".join(rev)
  return back

#Call the function anf print the output
print(rev_string(collect_string()))