Add everything I got

4b.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+sum=0
+
+while read a; do
+  IFS=, read x y <<< $a
+  IFS=- read x1 x2 <<< $x
+  IFS=- read y1 y2 <<< $y
+
+  if [[ $(( (x1 - y2) * (x2 - y1) )) -le 0 ]]; then
+    let sum++
+  fi
+  
+done
+
+echo $sum
+