A litle script, but I got no output

[Quattro]

Didn't help

Code:

input_1 = event.getvalue('0/2/3')
input_2 = event.getvalue('0/2/9')
output = '0/2/0'

if input_1 == true
  and input_2 == true then
grp.write(output, 35)
  end