alpha = eval(input())

print((chr(ord(alpha)+1)))
c = eval(input())

print((chr(ord(c)+1)))
alpha = eval(input())
print((chr(ord(alpha) + 1)))

c = eval(input())
print((chr(ord(c) + 1)))

-alpha = eval(input()) -print((chr(ord(alpha) + 1))) +c = eval(input()) +print((chr(ord(c) + 1)))