# python commands
import sys
import yap
engine = yap.YAPEngine();
# engine = yap.YAPEngine(yap.YAPParams());
def go():
while True:
s = raw_input("Prolog Query: ")
try:
q = engine.query(s)
except:
print "Oops! That was no valid number. Try again..."
while q.next():
vs = q.namedVars();
while vs.length() > 0:
eq = vs.car()
print eq.getArg(1).text() + " = " + eq.getArg(2).text()
vs = vs.cdr()
print "no more answers"
