**Time limit:**1.00 s**Memory limit:**512 MB

The aliens give you a positive integer $n$ and you have to find out if it has an even or odd number of divisors. If you can determine the correct answer, the aliens will abort their mission.

**Input**

The only input line has an integer $n$.

**Output**

Print "even" or "odd" according to the problem statement.

**Constraints**

- $1 \le n \le 10^{18}$

**Example 1**

Input:

`4`

Output:

`odd`

Explanation: The divisors of $4$ are $1$, $2$ and $4$.

**Example 2**

Input:

`6`

Output:

`even`

Explanation: The divisors of $6$ are $1$, $2$, $3$ and $6$.