αlphabet

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

inputFormat

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

outputFormat

Output

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

Examples

Input

B

Output

A

Input

a

Output

a

样例

a

a