def reductie(t,n):
    t2 = ''.join([letter for letter in str(t) if letter not in str(n)])
    n2 = ''.join([letter for letter in str(n) if letter not in str(t)])
    output = '({}, {})'.format(t2 if t2!='' else -1, n2 if n2!='' else -1)
    return output