script to combine two files into a single tab-delimited file

Hello,

I am needing to learn some perl in no-time at all to achive the following,

I have to files A and B

in A

x1
x2
x3
..
\newline
y1
y2
..
\newline
z1
z2
..

in file B

x
\newline
y
\newline
z
\newline
..

need to output a file C like this

x1 \tab x
x2 \tab x
x3 \tab x
..
\newline
y1 \tab y
y2 \tab y
..
\newline
z1 \tab z
..
..

Any ideas or pointers or any suggestions?

Thanks a lot in advance

Marco