Competitions

# PP1 Week 3 Contest 1

# Perfect square

Positive integer **n** is given. If **n** is a perfect square of some positive integer **m**, then print **m**. Otherwise print **No**.

#### Input

One positive integer **n**.

#### Output

Print the required answer.

Input example #1

25

Output example #1

5

Input example #2

27

Output example #2

No