#P1331F. Elementary!

Elementary!

Description

The input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.

Output "YES" or "NO".

Input

The input consists of a single string of uppercase letters A-Z. The length of the string is between 1 and 10 characters, inclusive.

Output

Output "YES" or "NO".

GENIUS
DOCTOR
IRENE
MARY
SMARTPHONE
REVOLVER
HOLMES
WATSON
YES
NO
YES
NO
NO
YES
NO
YES