An uppercase or lowercase English letter \alpha will be given as input. If \alpha is uppercase, print `A`; if it is lowercase, print `a`.

Constraints

* \alpha is an uppercase (`A` - `Z`) or lowercase (`a` - `z`) English letter.

Input

Input is given from Standard Input in the following format:


α


Output

If \alpha is uppercase, print `A`; if it is lowercase, print `a`.

Examples

Input

B


Output

A


Input

a


Output

a
mod = int(1e9+7)
def add(a, b):
    c = a + b
    if c >= mod:
        c -= mod
    return c

def main():
    #A, B = [int(x) for x in raw_input().split()]
    ch = raw_input()
    
    if ch.isupper():
        print('A')
    else:
        print('a')
    

main()