check_a = [chr(ord('a') + i) for i in range(26)]



s=eval(input())



if s in check_a:

    print('a')

else:

    print('A')
small = [chr(ord('a') + i) for i in range(26)]



s=eval(input())



if s in small:

    print('a')

else:

    print('A')
check_a = [chr(ord("a") + i) for i in range(26)]
s = eval(input())
if s in check_a:
    print("a")
else:
    print("A")

small = [chr(ord("a") + i) for i in range(26)]
s = eval(input())
if s in small:
    print("a")
else:
    print("A")

-check_a = [chr(ord("a") + i) for i in range(26)] +small = [chr(ord("a") + i) for i in range(26)] -if s in check_a: +if s in small: