Question

Hide String

Anit is given a sentence S.He wants to create an encoding of the sentence. The encoding works by replacing each letter with its previous letter as shown in the below table. Help Anil encode the

sentence.

Letter

Previous Letter

A

B

A

Note: Consider upper and lower case letters as different.

Input

The first line of input is a string S

Answer 1

def previous(letter):
    if letter == 'a':
        return 'z'
    if letter == 'A':
        return 'Z'
    if not letter.isalpha(): #checking is symbol a letter
        return letter
    return chr(ord(letter) - 1) #getting previus symbol by Unicode number

s = input()
encoded_s = ''
for letter in s:
    encoded_s += previous(letter)
    
print(encoded_s)

Simple input: aA Bc: zX7!

Simple output: zZ Ab: yW7!