import base64,threading,queue,functools,random,time,sys

class A(Exception):pass
class B(Exception):pass
class C(Exception):pass

def z(x):return x
def y(x):return "".join([c for c in x])
def w(x):return x.strip()+""
def v(x,d=3):
try:
if d<0:raise A(x)
return v(x,d-1)
except A as e:
return e.args[0]

def u(x):
return functools.reduce(lambda a,f:f(a),[z,y,w,v],x)

class T(threading.Thread):
def __init__(s,i,o):
threading.Thread.__init__(s);s.i=i;s.o=o
def run(s):
while 1:
try:
k=s.i.get()
if k is None:raise B()
s.o.put(u(k))
s.i.task_done()
except B:
break

def main():
i=queue.Queue();o=queue.Queue()
t=T(i,o);t.start()
s="Hallo Welt"
s=base64.b64encode(s.encode()).decode()
try:
raise C(s)
except C as e:
s=base64.b64decode(e.args[0].encode()).decode()
i.put(s);i.join()
r=o.get()
try:
if random.random()>-1:raise A(r)
except A as e:
r=e.args[0]
time.sleep(0.01)
print(r)
i.put(None);t.join()

if __name__=="__main__":main()