diff --git a/src/primeira_recorrencia/lucas_jkdrangel/index.js b/src/primeira_recorrencia/lucas_jkdrangel/index.js
new file mode 100644
index 0000000..e9ad34e
--- /dev/null
+++ b/src/primeira_recorrencia/lucas_jkdrangel/index.js
@@ -0,0 +1,14 @@
+let array = [...Array(26)].fill(0)
+let key = prompt('Entrada')
+key = key.split('')
+let test = false
+
+key.forEach(el => {
+    array[el.charCodeAt()-'A'.charCodeAt()]+=1
+    if(array[el.charCodeAt()-'A'.charCodeAt()]>1 && !test){
+        console.log(el);
+        test = true
+    }
+});
+if(!test) console.log(null)
+