Assignment  (Final exam)

Requirement:  Write a perl program to join two tables (two files) into one table. 

The data are from a real dataset.
1) the first file (male.sp4): is an output from signalP4 program to predict signal peptide from a set of protein sequences. You need to first retrieve the value in column 9 (N or Y) for each ID, Y means there is signal peptide, N means no signal peptide.  
2) the 2nd file (ps.parse): this file is from PS-scan (or called scan-prosite) for proteins having an ER retention signal.

Your program should be able to join the results from the two files to produce a single table (values is tab-delimited). For example your perl program is called "join2table.pl", it run like below:
$perl join2table.pl input1(male.sp4) input2(ps.parse) output

 The output file has a format like below:
The first column is ID, 2nd column is Y or N (you get from column 9 of the 1st file), the 3rd column is the value of "-" (if ID is not found in the second file) or "ER" (the ID is found in second file). 


Please note: for your first file, the values are seperated by 1 or more space, thus, may try to use following code to split:

 @tmpA = split (/[\s+]/, $line);

Note: a good program should check the IDs in both files, as the IDs may not be
identical, i. e., IDs in one file may not be in other file.