diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..fe038fa 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,21 @@
 export function mostUsedChar(text) {
     // implementar logica aqui
-    return ""
+    let array = [];
+    let stringText = text.toLowerCase();
+    let letrasJuntas = stringText.replace(/ /g, '');
+
+    for(let i = 0; i < letrasJuntas.length; i++) {
+        let letra = letrasJuntas.charAt(i);
+
+        if(array[letra] != undefined) array[letra]++
+        else array[letra] = 1;
+    }
+
+    let letrasOrdenadas = Object.keys(array).sort(function order(key1, key2) {
+        if(array[key1] > array[key2]) return -1;
+        else if(array[key1] < array[key2]) return +1;
+        else return 0;
+    })[0];
+
+    return letrasOrdenadas;
 }
\ No newline at end of file