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## unmatch
### Instructions
Write a function, `Unmatch`, that returns the element of the slice that does not have a correspondent pair.
- If all the number have a correspondent pair, it shoud return `-1`.
### Expected function
```go
func Unmatch(a []int) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
a := []int{1, 2, 3, 1, 2, 3, 4}
unmatch := piscine.Unmatch(a)
fmt.Println(unmatch)
}
```
And its output :
```console
$ go run .
4
$
```