awk if then "insert"

Shell Programming and Scripting
1

I have this output:

FA-7H
5001438004c224b8
5001438005692b18
5001438005694778
500143800569491c
50014380056952e0
c0507604cc5c00a2
FA-10H
5001438004c224ba
5001438005692b1a
5001438005694372
500143800569477a
50014380056952e2
c0507604cc5c00a0

I would like this:

FA-7H    5001438004c224b8
FA-7H    5001438005692b18
FA-7H    5001438005694778
FA-7H    500143800569491c
FA-7H    50014380056952e0
FA-7H    c0507604cc5c00a2
FA-10H    5001438004c224ba
FA-10H    5001438005692b1a
FA-10H    5001438005694372
FA-10H    500143800569477a
FA-10H    50014380056952e2
FA-10H    c0507604cc5c00a0

If then else?

2 
awk '/^FA-/{h=$0;}!/^FA-/{print h,$0;}' OFS='\t' filename
3

thanks! It's work