Problem2124--ABC192B - uNrEaDaBlE sTrInG

2124: ABC192B - uNrEaDaBlE sTrInG

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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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

AtCoder 强 字符串 青铜 循环 
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