diff --git a/app/create_file.py b/app/create_file.py
index fa56336e1..cbcd06f73 100644
--- a/app/create_file.py
+++ b/app/create_file.py
@@ -1 +1,111 @@
-# write your code here
+import sys
+import os
+from datetime import datetime
+
+
+def parse_args(argv: None) -> None:
+    """
+    Parse sys.argv manually to extract -d and -f flag values.
+    Returns (dir_parts, filename) where either can be None.
+    """
+    dir_parts = None
+    filename = None
+
+    i = 1
+    while i < len(argv):
+        if argv[i] == "-d":
+            dir_parts = []
+            i += 1
+            while i < len(argv) and not argv[i].startswith("-"):
+                dir_parts.append(argv[i])
+                i += 1
+        elif argv[i] == "-f":
+            i += 1
+            if i < len(argv):
+                filename = argv[i]
+                i += 1
+            else:
+                print("Error: -f flag requires a filename argument.")
+                sys.exit(1)
+        else:
+            print(f"Error: Unknown flag '{argv[i]}'.")
+            sys.exit(1)
+
+    return dir_parts, filename
+
+
+def collect_content() -> None:
+    """
+    Interactively collect lines from the user until they type 'stop'.
+    Returns formatted content block (timestamp + numbered lines).
+    """
+    lines = []
+    while True:
+        line = input("Enter content line: ")
+        if line.lower() == "stop":
+            break
+        lines.append(line)
+
+    timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+    block = timestamp + "\n"
+    for number, text in enumerate(lines, start=1):
+        block += f"{number} {text}\n"
+
+    return block
+
+
+def create_directory(dir_parts: None) -> None:
+    """Join dir_parts into a path and create it
+     (including any missing parents)."""
+    path = os.path.join(*dir_parts)
+    os.makedirs(path, exist_ok=True)
+    print(f"Directory created: {path}")
+    return path
+
+
+def create_file(directory: None, filename: None) -> None:
+    """
+    Collect content from user and write/append it to the file.
+    If the file already exists, appends a blank line then the new block.
+    """
+    filepath = os.path.join(directory, filename)
+
+    already_exists = os.path.isfile(filepath)
+
+    content_block = collect_content()
+
+    with open(filepath, "a") as f:
+        if already_exists:
+            f.write("\n")
+        f.write(content_block)
+
+    print(f"File saved: {filepath}")
+
+
+def main() -> None:
+    if len(sys.argv) < 2:
+        print("Usage:")
+        print("  python create_file.py -d dir1 dir2")
+        print("  python create_file.py -f file.txt")
+        print("  python create_file.py -d dir1 dir2 -f file.txt")
+        sys.exit(1)
+
+    dir_parts, filename = parse_args(sys.argv)
+
+    if dir_parts and filename:
+        directory = create_directory(dir_parts)
+        create_file(directory, filename)
+
+    elif dir_parts:
+        create_directory(dir_parts)
+
+    elif filename:
+        create_file(".", filename)
+
+    else:
+        print("Error: provide at least one flag: -d or -f")
+        sys.exit(1)
+
+
+main()