Hi all.
I have 2 files like this:

f1
A 10
B 80
C 9

f2
A 11
B 700
C 10

What I want is the concatenation of the two files sorted by name (alphabetically) and size (numerically), so the result should be like this:

F3 (cat f1 f2 sorted)
A 10
A 11
B 80
B 700
C 9
C 10

but the result I get when I do sort f1 f2 is:

A 10
A 11
B 700
B 80
C 10
C 9

Thanks for your help.