diff --git a/Strings/Amazing Subarrays/Solution.java b/Strings/Amazing Subarrays/Solution.java
index c0186db..1959731 100644
--- a/Strings/Amazing Subarrays/Solution.java	
+++ b/Strings/Amazing Subarrays/Solution.java	
@@ -1,13 +1,13 @@
 public class Solution {
-	public int solve(String A) {
-		int counter = 0;
-		A = A.toLowerCase();
-		for (int i = 0; i < A.length(); i++) {
-			if (A.charAt() == ) {
-				counter += A.length() - i;
-				counter %= 10003;
-			}
-		}
-		return counter;
-	}
+    public int solve(String A) {
+        if (A == null || A.length() == 0) return 0;
+        int counter = 0;
+        A = A.toLowerCase();
+        for (int i = 0; i < A.length(); i++) {
+            if (A.charAt(i) == 'a' || A.charAt(i) == 'e' || A.charAt(i) == 'i' || A.charAt(i) == 'o' || A.charAt(i) == 'u') {
+                counter += A.length() - i;
+            }
+        }
+        return counter % 10003;
+    }
 }