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## countalpha
### Instructions
Write a function `CountAlpha()` that takes a string as an argument and returns the number of alphabetic characters in the string.
### Expected functions
```go
func CountAlpha(s string) int {
}
```
### Usage
Here is a possible program to test your function:
```go
package main
import "fmt"
func main() {
fmt.Println(CountAlpha("Hello world"))
fmt.Println(CountAlpha("H e l l o"))
fmt.Println(CountAlpha("H1e2l3l4o"))
}
```
And its output:
```console
$ go run .
10
5
5
```