Answer 1

Ashwin Burnwal

Don't use replace function because it will replace all matching character in word so just do like this:

message = input().lower()
alphabets = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']

rev = alphabets[::-1]

#print (alp)
#print (rev)

str = ''

for i in message:
if i in alphabets:
str = str + rev[alphabets.index(i)]
else:
str = str + i

print(arr)

Answer 2

Strings are immutable. You should split the string into a list then loop over it.

Here is my approach anyway

msg = input().lower()

def encr(text):

letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]

revLetters = letters[::-1]

msgList = list(text)

encList = []

for letter in msgList:
if letter in letters:
letter = revLetters [letters.index(letter)]
encList.append(letter)
else:
encList.append(letter)

scrMsg = "".join(encList)

return scrMsg

print(encr(msg))