Problem Statement

You are given a string S consisting of <, =, and >.
Determine whether S is a bidirectional arrow string.
A string S is a bidirectional arrow string if and only if there is a positive integer k such that S is a concatenation of one <, k =s, and one >, in this order, with a length of (k+2).

Input

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

Output

If S is a bidirectional arrow string, print Yes; otherwise, print No.

Constraints

• S is a string of length between 3 and 100, inclusive, consisting of <, =, and >.

Sample Input 1

<====>

Sample Output 1

Yes

<====> is a concatenation of one <, four =s, and one >, in this order, so it is a bidirectional arrow string.
Hence, print Yes.

Sample Input 2

==>

Sample Output 2

No

==> does not meet the condition for a bidirectional arrow string.
Hence, print No.

Sample Input 3

<>>

Sample Output 3

No

见题面 Input 部分

见题面 Output 部分