I think you should use the cmp and <=> operators in the sort subroutine, like this :
@a = qw( words only contains );
@b = qw( 8 3 7 1 );
print join( " ", sort { $a <=> $b || $a cmp $b } @a ), "\n";
# contains only words
print join( " ", sort { $a <=> $b || $a cmp $b } @b ), "\n";
# 1 3 7 8
This way you can even sort numbers AND letters :
@a = qw( 2 two 1 one );
print join( " ", sort { $a cmp $b || $a <=> $b } @a ), "\n";
# 1 2 one two
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