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".
Samples
GENIUS
YES
DOCTOR
NO
IRENE
YES
MARY
NO
SMARTPHONE
NO
REVOLVER
YES
HOLMES
NO
WATSON
YES