# 3075 : 114101097100032118101114116105099097108108121

from sys import stdin

S=stdin.readline().rstrip()

result=''
for i in range(len(S)):
    if S[i]=='a':
        ch='z'
    elif S[i]=='A':
        ch='Z'
    else:
        ch=chr(ord(S[i])-1)
    result+=ch
print(result)