diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..316aef4 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,21 @@
 export function mostUsedChar(text) {
-    // implementar logica aqui
-    return ""
-}
\ No newline at end of file
+  // implementar logica aqui
+  let palavra = text.toLowerCase().split("").sort();
+  let i,
+    j,
+    k = 0;
+  let maisRepetido;
+  for (i in palavra) {
+    let char = palavra[i];
+    if (char === palavra[i - 1]) {
+      j++;
+      if (j > k) {
+        k = j;
+        maisRepetido = palavra[i];
+      }
+    } else {
+      j = 0;
+    }
+  }
+  return maisRepetido;
+}