Thanks Kolusu for your response. I am yet to try it out, but Enrico, i never demanded an answer, it was just a request, and i very well know how this forum goes. I respect your concern though. I was not trying to solicit answers, i had tried a way which paritally works, but dint wanna post it as it could be quite confusing.
Here is what i tried,
//SYSIN DD *
JOIN UNPAIRED F1,F2
In the next step, i overlayed 'B' that comes in the above output with 'Y'
But unfortunately, it worked only for the case when both the counts match. So i put this up here.