class Demented:
    def __init__(self,val,insane=0):
        self.val = val
        self.insane=insane

    def __repr__(self):
        if self.insane: raise NotImplementedError
        return repr(self.val)

    def __str__(self):
        if self.insane: raise NotImplementedError
        return str(self.val)

def a(i):
    raise Exception(Demented('mad'+`i`,i))

for i in 0,1:
    try:
        a(i)
    except:
        import traceback
        traceback.print_exc()

a(1)