diff --git a/README.md b/README.md
index 5a62879..77aacb4 100644
--- a/README.md
+++ b/README.md
@@ -31,5 +31,5 @@ You can download it from [here](https://www.python.org/downloads/).
 ### Windows
 
 ```bat
-run.bat
+.\run.bat
 ```
diff --git a/interactive_runner/__main__.py b/interactive_runner/__main__.py
index 132414a..15f9f88 100644
--- a/interactive_runner/__main__.py
+++ b/interactive_runner/__main__.py
@@ -1,23 +1,78 @@
-import interactive_runner as lib
+from typing import Literal, overload
 
-s = lib.Sources()
-for l in s.languages.values():
-    print("lname", l.name)
-    print("lsname", l.styled_name)
-    print("ldesc", l.description)
-    print("lbc", l._build_command)
-    print("ldni", l.check_dependencies_installed())
-    print("lisc", l.is_compiled)
-    print("lrcmd", l._run_command)
-    print()
-    for a in l.assignments.values():
-        print("alang", a.language)
-        print("aname", a.name)
-        print("agivend", a.given_date)
-        print("adesc", a.description)
-        print("adirs", a.directions)
+from chalky.shortcuts.sty import bold
+
+from . import Sources
+from .helpers import chalk_from_int as color
+
+__print = print
+__input = input
+__int = int
+
+green = color(0x39ff14)
+red = color(0xff0000)
+
+invalid_input = red | "Invalid input! Try again."
+
+sources = Sources()
+
+
+def print(*s: str, nl: bool = False) -> None:
+    __print(*s)
+    if nl:
+        __print()
+
+
+@overload
+def input(
+    *s: str,
+    nl: bool = False,
+    int: bool = Literal[True],
+    valid: set[int] | None = None
+) -> int:
+    ...
+
+
+@overload
+def input(*s: str, nl: bool = False) -> str:
+    ...
+
+
+def input(*s: str, nl: bool = False, int: bool = False, valid: set[int] | None = None) -> str | int:
+    r = __input(*s).lower().strip()
+    if r == "exit":
+        print(red | "Exiting...")
+        exit()
+    elif int:
         try:
-            a.run()
-        except Exception as e:
-            print("errrun", e)
-        print()
+            val = __int(r)
+            if valid and val not in valid:
+                print(invalid_input)
+                val = input(*s, int=int, valid=valid)
+            if nl:
+                print()
+        except ValueError:
+            print(invalid_input)
+            val = input(*s, int=int, valid=valid)
+        finally:
+            return val
+    else:
+        if nl:
+            print()
+        return r
+
+
+while True:
+    print("----------", green & bold | "MAIN MENU", "----------")
+    print(f"{green | 1}: Browse languages.")
+    print(f"{green | 2}: Invalidate all cache.", nl=True)
+
+    choice = input("Choose an option by its number: ", nl=True, int=True, valid={1, 2})
+
+    match choice:
+        case 1:
+            ...
+
+        case 2:
+            sources.refresh()
+            print(green | "Successfully invalidated all cache.", nl=True)
diff --git a/interactive_runner/helpers.py b/interactive_runner/helpers.py
index 606a88b..fcbeb10 100644
--- a/interactive_runner/helpers.py
+++ b/interactive_runner/helpers.py
@@ -21,7 +21,7 @@ def __rgb_from_int(i: int, /) -> tuple[int, int, int]:
 def chalk_from_int(foreground: int, background: int = None, /) -> Chalk:
     return Chalk(
         foreground=TrueColor(*__rgb_from_int(foreground)),
-        background=TrueColor(*__rgb_from_int(background))
+        background=TrueColor(*__rgb_from_int(background)) if background else None
     )
 
 
diff --git a/sources/c/star rating/star_rating.c b/sources/c/star rating/star_rating.c
index 6b3ac9e..b13d910 100644
--- a/sources/c/star rating/star_rating.c	
+++ b/sources/c/star rating/star_rating.c	
@@ -8,7 +8,7 @@ int main() {
 
     for (int i = 0; i < 21; i++) {
         printf("Review number %i, enter rating (1 to 5): ", i+1);
-        // read the input as int
+        // Read the input as int.
         scanf("%i", &ratings[i]);
 
         int rating = ratings[i];
@@ -18,7 +18,7 @@ int main() {
             return 1;
         }
 
-        // increment the star count for the stars
+        // Increment the star count for the stars.
         // (-1 is because indexes start from 0)
         ++rating_frequency[rating-1];
         total_stars += rating;