diff --git a/04/cleanup.py b/04/cleanup.py
new file mode 100644
index 0000000..85e32e7
--- /dev/null
+++ b/04/cleanup.py
@@ -0,0 +1,39 @@
+
+import fileinput
+from typing import Iterable
+
+class Range:
+
+    rmin: int
+    rmax: int
+    length: int
+
+    def __init__(self, rang: str):
+        self.rmin,self.rmax = map(lambda x: int(x), rang.strip().split('-'))
+        self.length = self.rmax - self.rmin + 1
+
+
+def solve(lines: Iterable[str]) -> int:
+    score = 0
+    for line in lines:
+        elf1, elf2 = map(lambda x: Range(x), line.strip().split(','))
+        if elf2.length > elf1.length:
+            elf2,elf1 = (elf1, elf2)
+        if elf1.rmin <= elf2.rmin and elf1.rmax >= elf2.rmax:
+            score += 1
+    return score
+
+def solveb(lines: Iterable[str]) -> int:
+    score = 0
+    for line in lines:
+        elf1, elf2 = map(lambda x: Range(x), line.strip().split(','))
+        if elf2.length > elf1.length:
+            elf2,elf1 = (elf1, elf2)
+        if elf1.rmin <= elf2.rmax and elf1.rmax >= elf2.rmin:
+            score += 1
+    return score
+
+
+if __name__ == "__main__":
+    print(solve(fileinput.input()))
+    print(solveb(fileinput.input()))
\ No newline at end of file
diff --git a/04/example b/04/example
new file mode 100644
index 0000000..99a66c5
--- /dev/null
+++ b/04/example
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
\ No newline at end of file