But we need to see the ICE201I message to know what level you have. It will be in the sysout of the step I asked you to run.
OK, for learning. Get your manual. If you don't have one, there's one on line (links at top and bottom of this page) and you can use it online or download as, for instance, a PDF.
In the manual, have a look at RESIZE. You might not feel that is what you want, but it is the easiest.
First, just put the three lines into one and show the results.
Then you'll need to get rid of the blanks.
First, do that in a SORT job, with OPTION COPY. Look at SQZ in the manual. You can use INREC with BUILD.
Then we get to doing it in one step.