diff --git a/zeta_python/completed/25425.py b/zeta_python/completed/25425.py
new file mode 100644
index 0000000..f5a9127
--- /dev/null
+++ b/zeta_python/completed/25425.py
@@ -0,0 +1,24 @@
+class RankRange:
+    def __init__(self, N, M, a, K):
+        # N: team, M: max person per team, a: remains, K: my team
+        self.N, self.M, self.a, self.K = N, M, a, K
+
+    def solve(self):
+        worst, best = -1, -1
+
+        except_us = self.a - self.K
+        # worst case 1
+        if except_us >= self.N - 1:
+            worst = self.N
+        else:
+            worst = except_us + 1
+
+        # best case
+        d, m = divmod(except_us, self.M)
+        best = d + 1 if m == 0 else d + 2
+        return worst, best
+
+
+if __name__ == "__main__":
+    N, M, a, K = map(int, input().split())
+    print(*RankRange(N, M, a, K).solve())
diff --git a/zeta_python/completed/29766.py b/zeta_python/completed/29766.py
new file mode 100644
index 0000000..202677f
--- /dev/null
+++ b/zeta_python/completed/29766.py
@@ -0,0 +1,10 @@
+if __name__ == "__main__":
+    S = input()
+    cnt = 0
+    now = 0
+    find = S.find("DKSH", now)
+    while find != -1:
+        cnt += 1
+        now = find + 4
+        find = S.find("DKSH", now)
+    print(cnt)
diff --git a/zeta_python/completed/29767.py b/zeta_python/completed/29767.py
new file mode 100644
index 0000000..2b518b0
--- /dev/null
+++ b/zeta_python/completed/29767.py
@@ -0,0 +1,20 @@
+class ToMaximize:
+    def __init__(self, N: int, K: int, A: list[int]):
+        self.N, self.K, self.A = N, K, A
+
+    def solve(self):
+        cumA = []
+        ss = 0
+        for i in range(self.N):
+            ss += self.A[i]
+            cumA.append((ss, i))
+        cumA.sort(key=lambda x: x[0])
+
+        popped = [cumA.pop()[0] for _ in range(self.K)]
+        return sum(popped)
+
+
+if __name__ == "__main__":
+    N, K = map(int, input().split())
+    A = list(map(int, input().split()))
+    print(ToMaximize(N, K, A).solve())
diff --git a/zeta_python/completed/29768.py b/zeta_python/completed/29768.py
new file mode 100644
index 0000000..05a9f74
--- /dev/null
+++ b/zeta_python/completed/29768.py
@@ -0,0 +1,17 @@
+class PalindromeGenerator:
+    def __init__(self, N, K):
+        self.N, self.K = N, K
+
+    def solve(self) -> str:
+        S = "abcdefghijklmnopqrstuvwxyz"
+        return "a" * (self.N - (self.K - 1)) + S[1 : self.K]
+
+
+if __name__ == "__main__":
+    # 3 1 => aaa
+    # N 1 =. a...a.
+    # 3 2 => aba
+    # 4 2 => aaab
+    # aaaaaaaaaaaaaaabc
+    N, K = map(int, input().split())
+    print(PalindromeGenerator(N, K).solve())