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SICT1016 - Цифрүүд ялгаатай эсэх

3 оронтой эерэг бүхэл тоо өгөгдөв. Цифрүүд нь ялгаатай бол YES, үгүй бол NO гэж хэвлэ. 

Input

3 оронтой эерэг бүхэл тоо

Output

Үр дүн

Example

Input:
122

Output:
NO

Added by:B@TJ@RG@L
Date:2014-02-18
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:C C++ 4.3.2 PYTHON

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