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.

-----Sample Input-----
1 21

-----Sample Output-----
Yes

As 121 = 11 × 11, it is a square number.

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