题目描述
AtCoDeer the deer has found two positive integers, a and b. Determine whether the concatenation of a and b in this order is a square number.
Constraints
- 1 ≤ a,b ≤ 100
- a and b are integers.
Input
Input is given from Standard Input in the following format:
a b
Output
If the concatenation of a and b in this order is a square number, print Yes; otherwise, print No.
Examples
Input
1 21
Output
Yes
Input
100 100
Output
No
Input
12 10
Output
No
输入格式
见题面
输出格式
见题面
样例输入
1 21
样例输出
Yes