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## alphacount
### Instructions
Write a function that counts only the letters of a `string` and that returns that count.
- White spaces or any other characters should not be counted.
The letters are only the ones from the latin alphabet.
### Expected function
```go
func AlphaCount(s string) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
s := "Hello 78 World! 4455 /"
nb := piscine.AlphaCount(s)
fmt.Println(nb)
}
```
And its output :
```console
$ go run .
10
$
```