diff --git "a/junehee/[3\354\260\250] \354\225\225\354\266\225.js" "b/junehee/[3\354\260\250] \354\225\225\354\266\225.js"
new file mode 100644
index 0000000..7a763e6
--- /dev/null
+++ "b/junehee/[3\354\260\250] \354\225\225\354\266\225.js"	
@@ -0,0 +1,16 @@
+function solution(msg) {
+    const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split("");
+    const answer = [];
+    
+    for (let i = 0; i < msg.length; i++) {
+        for (let j = msg.length; j > i; j--) {
+            if (alphabet.includes(msg.slice(i, j))) {
+                alphabet.push(msg.slice(i, j + 1));
+                answer.push(alphabet.indexOf(msg.slice(i, j)) + 1);
+                i += (j - i - 1);
+            }
+        }
+    }
+    
+    return answer;
+}