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
from sys import stdin, stdout
read = stdin.readline
write = stdout.write
flush = stdout.flush
xr = xrange

def main():
	c = read().strip()
	if ord(c) - ord('A') <= 26: write('A\n')
	else: write('a\n')

if __name__ == "__main__":
	main()