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+## Weareunique
+
+### Instructions
+
+Write a function that takes two strings and returns the amount of characters that are not included in both without doubles.
+
+- If there is no unique charachters return -1.
+- If both strings are empty  or one of them return -1.
+
+
+### Expected function
+
+```go
+
+func Weareunique(str1 , str2 string) int {
+
+}
+
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+
+	arr := [][]string{
+		{"foo", "boo"},
+		{"abc", "def"},
+		{"hello", "yoall"},
+		{"everyone", ""},
+		{"hello world", "fam"},
+	}
+
+    for 
+}
+```
+
+And its output :
+
+```console
+$ go run .
+1
+6
+4
+-1
+10
+$
+```
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