diff --git a/students/dychowicz_monika/lesson_10_organizing_files/README.md b/students/dychowicz_monika/lesson_10_organizing_files/README.md
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+### Lesson 10 - Organizing Files
+#### introduction
+- [Automate the Boring Stuff with Python / Chapter 9](https://automatetheboringstuff.com/chapter9/)
+#### practice projects
+1. [Automate the Boring Stuff with Python / Chapter 9 / Selective Copy](https://automatetheboringstuff.com/chapter9/)
+1. [Automate the Boring Stuff with Python / Chapter 9 / Deleting Unneeded Files](https://automatetheboringstuff.com/chapter9/)
+1. [Automate the Boring Stuff with Python / Chapter 9 / Filling in the Gaps](https://automatetheboringstuff.com/chapter9/)
diff --git a/students/dychowicz_monika/lesson_10_organizing_files/deleting_unneeded_files.py b/students/dychowicz_monika/lesson_10_organizing_files/deleting_unneeded_files.py
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+++ b/students/dychowicz_monika/lesson_10_organizing_files/deleting_unneeded_files.py
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+import os
+
+max_size = 100000000
+
+
+def delete_unneeded_files(folder):
+    for foldername, subfolders, filenames in os.walk(folder):
+        for filename in filenames:
+            filename = os.path.join(folder, filename)
+            if os.path.getsize(filename) > max_size:
+                print(filename)
+
+
+if __name__ == '__main__':
+    delete_unneeded_files(r"C:\Users\dychomon\Downloads")
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diff --git a/students/dychowicz_monika/lesson_10_organizing_files/filling_the_gaps.properties.py b/students/dychowicz_monika/lesson_10_organizing_files/filling_the_gaps.properties.py
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+++ b/students/dychowicz_monika/lesson_10_organizing_files/filling_the_gaps.properties.py
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+import os
+import re
+
+prefix = "spam"
+pattern = re.compile(prefix + r'.*(\d{3})')
+
+
+def fill_the_gaps(folder):
+    for foldername, subfolders, filenames in os.walk(folder):
+        filenames = sorted(filenames)
+        index = 1
+        new_filename = ""
+        for filename in filenames:
+            if pattern.match(filename):
+                if index == 1:
+                    new_filename = filename
+                print(filename, new_filename, index)
+                if filename != new_filename:
+                    print(
+                        "Lack of filename: " + new_filename + "\nFile " +
+                        filename + " will be renamed.")
+                    filename_path = os.path.join(foldername, filename)
+                    new_filename_path = os.path.join(foldername, new_filename)
+                    os.rename(filename_path, new_filename_path)
+                new_filename = filename.replace(str(index), str(index + 1))
+                index += 1
+
+
+if __name__ == '__main__':
+    fill_the_gaps("C:\Python36\gaps")
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diff --git a/students/dychowicz_monika/lesson_10_organizing_files/selective_copy.py b/students/dychowicz_monika/lesson_10_organizing_files/selective_copy.py
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+++ b/students/dychowicz_monika/lesson_10_organizing_files/selective_copy.py
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+import os
+import shutil
+
+
+def selective_copy(source_folder, destination_folder, extension):
+    for foldername, subfolders, filenames in os.walk(source_folder):
+        for filename in filenames:
+            if filename.lower().endswith(extension):
+                shutil.copy(os.path.join(source_folder, filename),
+                            destination_folder)
+
+
+source = r'C:\python_to_copy'
+destination = r'C:\python_copied'
+ext = '.txt'
+
+if __name__ == '__main__':
+    selective_copy(source, destination, ext)
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