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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(str string) int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
piscine ".."
)
func main() {
str := "Hello 78 World! 4455 /"
nb := piscine.AlphaCount(str)
fmt.Println(nb)
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
10
student@ubuntu:~/[[ROOT]]/test$
```