human
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

=====
Write me a Python code to print `A`?
assistant
#Here is Python code to print `A`.

FAST_IO = 0
if FAST_IO:
    import io, sys, atexit
    rr = iter(sys.stdin.read().splitlines()).next
    sys.stdout = _OUTPUT_BUFFER = io.BytesIO()
    @atexit.register
    def write():
        sys.__stdout__.write(_OUTPUT_BUFFER.getvalue())
else:
    rr = raw_input
rri = lambda: int(rr())
rrm = lambda: map(int, rr().split())
rrmm = lambda n: [rrm() for _ in xrange(n)]

####

from collections import defaultdict as ddic

s = rr()
if s.isupper():
    print 'A'
else:
    print 'a'