Напомена: ово је **незванична** копија задатака. Као таква, не гарантује се да ће овај сајт бити одржаван, и немојте се изненадити ако са њега задаци одједном нестану.

The postman arrived with a mysterious letter from an unknown sender.
The strangest thing about it is that the message was sent in early 2023,
but still somehow arrived in mid-December 2022. Upon opening the letter,
you found a video recording of the final match of the World Cup, which
is yet to be played between Argentina and France. The letter also
contained a “spoiled” final score for the game. You decided to watch
this odd video from the future.

During the half-time, you looked at the current result \(x:y\) and remembered the predicted final
result \(a:b\) from the letter. You
started wondering: is it possible to predict which team would be the
next to score a goal, assuming that the result in the letter was
correct? This problem asks you to answer this question.

The first line of standard input contains two natural numbers \(a\) and \(b\), the “spoiled” result.

The second line of standard input contains two integers \(x\) and \(y\), the half-time score.

Your program should print one line to the standard output:

`prvi`

if the first team (with scores \(a\) and \(x\)) must be the next team to score.
`drugi`

if the second team (with scores \(b\) and \(y\)) must be the next team to score.
`nijedan`

if there will not be any more goals.
`?`

if it is not possible to predict the next team to
score.

## Sample 1

```
1 2
1 0
```

### Output

`drugi`

## Sample 2

```
1 1
1 1
```

### Output

`nijedan`

## Sample 3

```
4 4
3 2
```

### Output

`?`

## Explanation

In the first testcase, the first team already scored all of their
goals for the game, but the second team didn’t. The only possible
continuation is \(1:0 \to 1:1 \to
1:2\). Therefore, the second team has to be the next to
score.

In the second testcase, all goals happen before the half-time, so
there will be no further goals.

In the third testcase, there are multiple continuations and it is not
possible to predict the next goal:

- \(3:2 \to 4:2 \to 4:3 \to
4:4\)
- \(3:2 \to 3:3 \to 4:3 \to
4:4\)
- \(3:2 \to 3:3 \to 3:4 \to
4:4\)

## Constraints

- \(0 \leq a, b \leq 100\)
- \(0 \leq x \leq a\)
- \(0 \leq y \leq b\)

Testcases are split into three disjoint groups:

- In tests worth 20 points: there is exactly one goal in \(a:b\).
- In tests worth 20 points: one team scored no goals in \(a:b\).
- In tests worth 60 points: no additional constraints.