diff --git a/README.md b/README.md
index 6a4f722..336782f 100644
--- a/README.md
+++ b/README.md
@@ -25,15 +25,4 @@ python main.py
 ```
 
 ***
-
-this program shows you the results of insertion and merge sorts for each algorithm, it also shows some additional information, such as:
-* time,
-* swap counter,
-* comparison counter.
-
-counters represent the numbers of corresponding operations that occurred during the sorting process.
-
-the list of objects is taken from *basin.csv* file. Each row there represents a new object as a sequence of its properties' values separated by commas. The order is:
-```
-address, volume_of_water, max_number_of_visitors
-```
+Цей код шукає підстрічки у стрічці за допомогою наївного алгоритму.
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..e1d2cbf
--- /dev/null
+++ b/main.py
@@ -0,0 +1,10 @@
+def naive_search(string: str, substring: str) -> list:
+    result = []
+    if string is not None and substring is not None and len(string) >= len(substring) and len(substring) != 0:
+        for element in range(len(string) - len(substring) + 1):
+            for sub_element in range(len(substring)):
+                if not string[element + sub_element] == substring[sub_element]:
+                    break
+            else:
+                result.append((element, element + len(substring)))
+    return result
\ No newline at end of file
diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..56ce760
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,23 @@
+import unittest
+
+from main import naive_search
+
+
+class MyTestCase(unittest.TestCase):
+    def test_naive_search(self):
+        self.assertEqual(naive_search("aabaacaadaabaaba", "aaba"), [(0, 4), (9, 13), (12, 16)])
+        self.assertEqual(naive_search("AABCCAADDEE", "FAA"), [])
+        self.assertEqual(naive_search("AAAAAAA", "AAAA"), [(0, 4), (1, 5), (2, 6), (3, 7)])
+        self.assertEqual(naive_search("AAAAAAAAAAAAAAAAAB", "AAAB"), [(14, 18)])
+
+    def test_empty_string(self):
+        self.assertEqual(naive_search("","abc"), [])
+
+    def test_empty_substr(self):
+        self.assertEqual(naive_search("abc",""),[])
+
+
+
+
+if __name__ == '__main__':
+    unittest.main()