diff --git a/froglike6/README.md b/froglike6/README.md
index 11d89bd..0470a70 100644
--- a/froglike6/README.md
+++ b/froglike6/README.md
@@ -21,4 +21,5 @@
  | 17차시 | 2025.05.22 | 기하학 | [아맞다우산](https://www.acmicpc.net/problem/17244)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/66|
  | 18차시 | 2025.07.03 | 자릿수를 이용한 다이나믹 프로그래밍 | [합 찾기](https://www.acmicpc.net/problem/7786)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/69|
  | 19차시 | 2025.07.04 | 애드 혹 | [서로소 그래프 게임](https://www.acmicpc.net/problem/34035)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/72|
+ | 20차시 | 2025.07.09 | 조합론 | [암호 만들기](https://www.acmicpc.net/problem/1759)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/77|
  ---
diff --git a/froglike6/combinatorics/1759.py b/froglike6/combinatorics/1759.py
new file mode 100644
index 0000000..28031d4
--- /dev/null
+++ b/froglike6/combinatorics/1759.py
@@ -0,0 +1,12 @@
+from itertools import combinations
+import sys
+input = sys.stdin.readline
+
+L, C = map(int, input().split())
+letters = sorted(input().split())
+vowels = {'a', 'e', 'i', 'o', 'u'}
+
+for combo in combinations(letters, L):
+    v_cnt = sum(ch in vowels for ch in combo)
+    if v_cnt >= 1 and L - v_cnt >= 2:
+        print(''.join(combo))
\ No newline at end of file