diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1d17dae
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.venv
diff --git a/level_1/1.py b/level_1/1.py
index 1813c9f..97ba86b 100644
--- a/level_1/1.py
+++ b/level_1/1.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def is_user_banned(user_id: ___) -> ___:
+def is_user_banned(user_id: int) -> bool:
     pass
 
 
diff --git a/level_1/10.py b/level_1/10.py
index d31d5d1..7c88c12 100644
--- a/level_1/10.py
+++ b/level_1/10.py
@@ -3,7 +3,7 @@
 from constants import ___
 
 
-def stringify(value: ___) -> ___:
+def stringify(value: str|int|float|None) -> str:
     pass
 
 
diff --git a/level_1/2.py b/level_1/2.py
index 8a2c1bf..8558a13 100644
--- a/level_1/2.py
+++ b/level_1/2.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def is_adult(age: ___, country_name: ___) -> ___:
+def is_adult(age: int, country_name: str) -> bool:
     pass
 
 
diff --git a/level_1/3.py b/level_1/3.py
index ae55bfd..d4efe06 100644
--- a/level_1/3.py
+++ b/level_1/3.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def compose_full_name(first_name: ___, last_name: ___, middle_name: ___) -> ___:
+def compose_full_name(first_name: str, last_name: str, middle_name: None|str) -> str:
     pass
 
 
diff --git a/level_1/4.py b/level_1/4.py
index 4b4cbe5..4522ac4 100644
--- a/level_1/4.py
+++ b/level_1/4.py
@@ -3,7 +3,7 @@
 from constants import ___
 
 
-def calculate_age(date_of_birth: ___) -> ___:
+def calculate_age(date_of_birth: datetime.date) -> int:
     pass
 
 
diff --git a/level_1/5.py b/level_1/5.py
index 0728530..9b06931 100644
--- a/level_1/5.py
+++ b/level_1/5.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def is_correct_email(raw_email: ___) -> ___:
+def is_correct_email(raw_email: str) -> bool:
     pass
 
 
diff --git a/level_1/6.py b/level_1/6.py
index 7cb57fc..0d1492c 100644
--- a/level_1/6.py
+++ b/level_1/6.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def is_loan_amount_too_big(loan_amount_usd: ___, max_loan_amount_for_user_usd: ___) -> ___:
+def is_loan_amount_too_big(loan_amount_usd: int, max_loan_amount_for_user_usd: int|None) -> bool:
     pass
 
 
diff --git a/level_1/7.py b/level_1/7.py
index 68c6890..912fdc0 100644
--- a/level_1/7.py
+++ b/level_1/7.py
@@ -1,7 +1,7 @@
 from constants import ___
 
 
-def send_email(header: ___, text_content: ___, send_to: ___) -> ___:
+def send_email(header: str, text_content: str, send_to: str) -> None:
     pass
 
 
diff --git a/level_1/8.py b/level_1/8.py
index 8ba8083..bc52ca7 100644
--- a/level_1/8.py
+++ b/level_1/8.py
@@ -4,7 +4,8 @@
 from constants import ___
 
 
-def get_user_balance(user_id: ___) -> ___:
+
+def get_user_balance(user_id: uuid.UUID) -> decimal.Decimal:
     pass
 
 
diff --git a/level_1/9.py b/level_1/9.py
index fb7fc80..1f70d43 100644
--- a/level_1/9.py
+++ b/level_1/9.py
@@ -3,7 +3,7 @@
 from constants import ___
 
 
-def is_correct_int(raw_int: ___) -> ___:
+def is_correct_int(raw_int: str | None) -> bool:
     pass
 
 
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..34da284
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+pytest==7.2.1
+mypy
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..fa158d3
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,7 @@
+[mypy]
+ignore_missing_imports = True
+disallow_incomplete_defs = True
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+exclude = tests
+