diff --git a/code_study/Baekjoon/java/_1620.java b/code_study/Baekjoon/java/_1620.java
new file mode 100644
index 0000000..575dd1b
--- /dev/null
+++ b/code_study/Baekjoon/java/_1620.java
@@ -0,0 +1,30 @@
+import java.util.*;
+
+public class _1620 {
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        String[] num = sc.nextLine().split(" ");
+        int N = Integer.parseInt(num[0]);
+        int M = Integer.parseInt(num[1]);
+
+        Map<Integer, String> pokeDoc1 = new HashMap<>();
+        Map<String, Integer> pokeDoc2 = new HashMap<>();
+        for(int i=0; i<N; i++){
+            String pokeName = sc.nextLine();
+            pokeDoc1.put(i+1, pokeName);
+            pokeDoc2.put(pokeName, i+1);
+        }
+        
+        for(int i=0; i<M; i++) {
+            String quest = sc.nextLine();
+            char ch = quest.charAt(0);
+            if('0' <= ch && ch <= '9'){
+                System.out.println(pokeDoc1.get(Integer.parseInt(quest)));
+            }
+            else {
+                System.out.println(pokeDoc2.get(quest));
+            }
+        }
+        sc.close();
+    }
+}
\ No newline at end of file
diff --git a/code_study/Baekjoon/python/1764.py b/code_study/Baekjoon/python/1764.py
new file mode 100644
index 0000000..766b253
--- /dev/null
+++ b/code_study/Baekjoon/python/1764.py
@@ -0,0 +1,14 @@
+import sys
+N, M = map(int,sys.stdin.readline().rstrip().split())
+setN = set()
+setM = set()
+for _ in range(N):
+    setN.add(sys.stdin.readline().rstrip())
+for _ in range(M):
+    setM.add(sys.stdin.readline().rstrip())
+
+result = list(setN&setM)
+result.sort()
+sys.stdout.write(str(len(result))+'\n')
+for s in result:
+    sys.stdout.write(s+'\n')