diff --git a/LeetCode/src/main/java/com/code/leet/week/Solution238.java b/LeetCode/src/main/java/com/code/leet/week/Solution238.java
new file mode 100644
index 0000000..155506d
--- /dev/null
+++ b/LeetCode/src/main/java/com/code/leet/week/Solution238.java
@@ -0,0 +1,69 @@
+package com.code.leet.week;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Created with IntelliJ IDEA.
+ * User: 轩辕龙儿
+ * Date: 2021/4/25
+ * Time: 10:29
+ * Description: No Description
+ */
+public class Solution238 {
+    public static void main(String[] args) {
+        Solution238 solution238 = new Solution238();
+//        System.out.println(solution238.sumBase(42, 2));
+
+        System.out.println(solution238.longestBeautifulSubstring("aeiaaioaaaaeiiiiouuuooaauuaeiu"));
+        System.out.println(solution238.longestBeautifulSubstring("aeeeiiiioooauuuaeiou"));
+        System.out.println(solution238.longestBeautifulSubstring("a"));
+    }
+
+    public int sumBase(int n, int k) {
+        int sum = 0;
+        String str = "";
+        while (n > 0) {
+            str += n % k;
+            n /= k;
+        }
+        for (int i = 0; i < str.length(); i++) {
+            sum += str.charAt(i) - '0';
+        }
+        return sum;
+    }
+
+    public int longestBeautifulSubstring(String word) {
+        if (word.length() < 5) {
+            return 0;
+        }
+        int num = 1;
+        int max = 0;
+        int index = word.indexOf("a");
+        int ch = 'a';
+        List<Character> list = Arrays.asList('a', 'e', 'i', 'o', 'u');
+        int flag = 0;
+        while (index >= 0) {
+            for (int i = index + 1; i < word.length(); i++) {
+                if (word.charAt(i) != ch && word.charAt(i) != ch + 1) {
+                    if (ch == 'e') {
+                        max = Math.max(num, max);
+                    }
+                    index = index + num + word.substring(index + num).indexOf("a");
+                    num = 1;
+                    flag = 0;
+                    break;
+                }
+                if (word.charAt(i) == ch) {
+                    num++;
+                }
+                if (word.charAt(i) == list.get(flag + 1)) {
+                    ch = ch + 1;
+                    flag++;
+                }
+            }
+        }
+        return max;
+    }
+}