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+## alpha-position
+
+## instructions
+
+Write a function named `AlphaPosition` that takes an alphabetical character as a parameter and returns the position of the letter in the alphabet.
+- If the character is not in the alphabet, return -1
+- If the character is in the alphabet, return the position of the letter in the alphabet
+  
+### Expected function
+
+```go
+func AlphaPosition(c rune) int {
+    // your code goes here
+}
+```
+
+### usage
+
+```go 
+package main
+
+import "fmt"
+
+func main(){
+    fmt.Println(AlphaPosition('a'))
+    fmt.Println(AlphaPosition('z'))
+    fmt.Println(AlphaPosition('B'))
+    fmt.Println(AlphaPosition('Z'))
+    fmt.Println(AlphaPosition('0'))
+    fmt.Println(AlphaPosition(' '))
+}
+```
+
+### output
+
+```console
+$ go run . | cat -e
+1$
+26$
+2$
+26$
+-1$
+-1$
+```