feat: add task 3

task3/main.py

@@ -0,0 +1,25 @@
+from collections import deque
+from typing import Iterable, Reversible
+
+
+def read_numbers() -> list[int]:
+    return list(map(int, input("A=").split()))
+
+def get_modified_sequence(numbers: Reversible[int]) -> Iterable[int]:
+    stack: deque[int] = deque()
+    result: deque[int] = deque()
+    for number in reversed(numbers):
+        while stack:
+            if stack[-1] >= number:
+                result.appendleft(stack[-1])
+                break
+            stack.pop()
+        else:
+            result.appendleft(0)
+        stack.append(number)
+    return result
+
+def print_sequence(sequence: Iterable[int]) -> None:
+    print(f"A={' '.join(map(str, sequence))}")
+
+print_sequence(get_modified_sequence(read_numbers()))