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1 
#with .find() method (super sloppy. System's answer was much better formatted)
def substring_between_letters(word, start, end):
  answer = word[word.find(start) + 1 : word.find(end)]
  if word.find(end) == -1:
    return word
  elif word.find(start) == -1:
    return word
  else:
    return answer

#Without .find() method
# Write your substring_between_letters function here:

def substring_between_letters(word, start, end):
  start_value = 0
  end_value = 0
  
  while start_value < len(word):
    if word[start_value] != start:
      start_value += 1
    else: 
      break
 
  while end_value > -len(word):
    if word[end_value] != end:
      end_value += -1
    else: 
      break
      
  if start_value == len(word):
    return word
  elif end_value == -len(word):
    return word
  else:
    return word[start_value + 1: end_value]
  
# Uncomment these function calls to test your function:
print(substring_between_letters("apple", "p", "e"))
# should print "pl"
print(substring_between_letters("apple", "p", "c"))
# should print "apple"```
2

This is the mot simple version I could think of:

def substring_between_letters(word, start, end):
  if start not in word or end not in word:
    return word
  else:
    return word[word.find(start)+1:word.find(end)]
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