push "a"
use print(1)
push invstring
push ""
use =(2)
push "label4"
use goto(1)
push "e"
use print(1)
push "label5"
use goto(1)
push "label1"
use goto(1)
push "b"
use print(1)
push "label2"
use goto(1)
push "c"
use print(1)
push "label3"
use goto(1)
push "d"
use print(1)
push "b"
use print(1)