### Instructions

Write a program that checks if a number up to a given number is an odd or even number.
The number will be between `0` and `100`.

- If the number is `odd` then it prints `ping` as in the example below.
- If the number is `even` then it prints `pong`.
- If the number of arguments is invalid then do nothing.

### Usage

```console
$ go run . 6 | cat -e
0 ping$
1 pong$
2 ping$
3 pong$
4 ping$
5 pong$
$ go run . | cat -e
$
```