Forums Scripts & Popups Random ammount of letters/num at start of sentence

What i need to do but have no clue where to start is this
I want random ammount of letters / numbers at the beggining of a sentence.
eg.
abcd HELLO
abcdef HELLO
abc HELLO

Any and all help appreciated.
Thanks

on *:INPUT:#:{
msg # $replace($1-,$1-,$str($r(a,z),$r(1,10)) $+ $1-)
}

bit ambiguous but i'll try,

if u want a random number of 1-x random letters then use:
$str($rand(a, z), $rand(1, x)

or if u want it ordered like abcdef... and still x number of letters then the easiest way is to do :
/set %charlist abcdefghijklmnopqrstuvwxz
in a chan or status win, then use:
$left(%charlist, $rand(1, x))

if both they are wrong pls b more specific

Thanks for the help all
I got there using a text file but it does the job I needed.