diff --git "a/Seol-JY/202510/21 BOJ G4 \353\213\250\354\226\264 \354\210\230\355\225\231.md" "b/Seol-JY/202510/21 BOJ G4 \353\213\250\354\226\264 \354\210\230\355\225\231.md"
new file mode 100644
index 00000000..78c58917
--- /dev/null
+++ "b/Seol-JY/202510/21 BOJ G4 \353\213\250\354\226\264 \354\210\230\355\225\231.md"	
@@ -0,0 +1,35 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int n = Integer.parseInt(br.readLine());
+        
+        Map<Character, Integer> weights = new HashMap<>();
+        
+        for (int i = 0; i < n; i++) {
+            String word = br.readLine();
+            int len = word.length();
+            for (int j = 0; j < len; j++) {
+                char c = word.charAt(j);
+                int weight = (int) Math.pow(10, len - 1 - j);
+                weights.put(c, weights.getOrDefault(c, 0) + weight);
+            }
+        }
+        
+        List<Integer> weightList = new ArrayList<>(weights.values());
+        weightList.sort((a, b) -> b - a);
+        
+        int result = 0;
+        int digit = 9;
+        for (int weight : weightList) {
+            result += weight * digit;
+            digit--;
+        }
+        
+        System.out.println(result);
+    }
+}
+```