CHAP 7 DEMO 5 - SPLIT Issue

Hello,
I am going through the "Big Data Hadoop Developer" course and currently going through
the Pig scripting chapter 7. I am currently at 7.44 and faced an issue with
DEMO5 (Write a Pig script to perform combining, spliting and joining relations.)
I was able to do a UNION on month_quad.
However I am facing an issue while trying to execute the following command
on grunt> -

SPLIT month_quad INTO split_jan IF SUBSTRING(date,4,6)=='01',
split_feb IF SUBSTRING(date,4,6)=='02',
split_mar IF...

CHAP 7 DEMO 5 - SPLIT Issue