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 S is hard-to-read.

Input

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

Output

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

Constraints

• S consists of uppercase and lowercase English letters.
• The length of S is between 1 and 1000 (inclusive).

Sample Input 1

dIfFiCuLt

Sample Output 1

Yes

The odd-positioned characters are all lowercase and the even-positioned characters are all uppercase, so it is hard-to-read.

Sample Input 2

eASY

Sample Output 2

No

The 3-rd character is not lowercase, so it is not hard-to-read.

Sample Input 3

a

Sample Output 3

Yes

见题面 Input 部分

见题面 Output 部分