L20Q1_ShiftALetter.py

# Write a procedure, shift, which takes as its input a lowercase letter,
# a-z and returns the next letter in the alphabet after it, with 'a'
# following 'z'.

def shift(letter):
    letter = ord(letter)
    if letter < 122:
        return chr(letter+1)
    if letter == 122:
        return chr(97)



#print shift('a')
#>>> b
#print shift('n')
#>>> o
#print shift('z')
#>>> a