diff --git a/LabMD_2/check.py b/LabMD_2/check.py
index 8b13789..c698042 100644
--- a/LabMD_2/check.py
+++ b/LabMD_2/check.py
@@ -1 +1,50 @@
+def checkLength(passw):
+    if 20 >= len(passw) >= 8:
+        return 0
+    elif len(passw) > 20:
+        return len(passw) - 20
+    return 8 - len(passw)
 
+
+def checkRepeating(passw):
+    steps = 0
+    letters = {x: 0 for x in passw}
+    for x in passw:
+        letters[x] += 1
+    for x in letters:
+        if letters[x] > 2:
+            steps += letters[x] - 2
+    if steps == 0:
+        return 0
+    return steps
+
+
+def checkComposition(passw):
+    # lowercase, uppercase, numeric, special
+    values = [0, 0, 0, 0]
+    counter = 0
+    for x in passw:
+        if x.islower():
+            values[0] = 1
+        if x.isupper():
+            values[1] = 1
+        if x.isnumeric():
+            values[2] = 1
+        if x in ['@', '_', '!', '#', '$', '%', '^', '&', '*', '(', ')', '<', '>', '?', '/', '\'', '|', '}', '{', '~',
+                 ':', '-']:
+            values[3] = 1
+    for x in values:
+        if x == 1:
+            counter += 1
+    return 4 - counter
+
+
+def checkPassword(passw):
+    x = max(checkLength(passw), checkComposition(passw), checkRepeating(passw))
+    if x:
+        return x
+    return "good"
+
+
+passw = input()
+print(checkPassword(passw))