diff --git a/day04.py b/day04.py
new file mode 100644
index 0000000..1bd8062
--- /dev/null
+++ b/day04.py
@@ -0,0 +1,14 @@
+import fileinput
+
+part1, part2 = 0, 0
+
+for line in fileinput.input():
+    a, b = line.split(",", 1)
+    a1, a2 = [int(x) for x in a.split("-", 1)]
+    b1, b2 = [int(x) for x in b.split("-", 1)]
+
+    part1 += (a1 >= b1 and b2 >= a2) or (b1 >= a1 and a2 >= b2)
+    part2 += a1 <= b2 and a2 >= b1
+
+
+print(part1, part2)