Simple Smurf

Simple Smurf is a very simple language invented by User:A.

It initializes the tack with input, in the end pop a string and output, and pop another to execute as a program.

j	Pop 2 variable names and join their values.
s	splits a string into a head and a tail and pushes them onto the stack (tail first)
"	next character is added to the string buffer. This ends with '?' .
p	pops two strings from the stack, and sets the variable with the name specified by the first string to the value specified by the second string.
q	quotes the string on the top.