2878: ABC192B - uNrEaDaBlE sTrInG

Memory Limit：128 MB Time Limit：1.000 S
Judge Style：Text Compare Creator：
Submit：11 Solved：5

Description

Problem Statement

We call a string hard-to-read when its odd-positioned (1-st, 3-rd, 5-th, ... from the beginning) characters are all lowercase English letters and its even-positioned characters (2-nd, 4-th, 6-th, ... from the beginning) are all uppercase English letters.
Determine whether a string SS is hard-to-read.

Constraints

  • SS consists of uppercase and lowercase English letters.
  • The length of SS is between 11 and 10001000 (inclusive).

Input

Input

Input is given from Standard Input in the following format: 
S

Output

Output

If S is hard-to-read, print Yes; otherwise, print No.

Sample Input Copy 

dIfFiCuLt

Sample Output Copy 

Yes

Source/Category

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