u could do something simple like

var %x = %!@
var %y = $+($left(%x,$r(1,3),$left(%x,$r(1,3),$left(%x,$r(1,3))
msg $chan Slots: %y
if (%y == %%%) { msg $chan jackpot | add points }
if (%y == !!!) { msg $chan jackpot | add points }
if (%y == @@@) { msg $chan jackpot | add points }