def FermatFactor(N):
    A= m.ceil(m.sqrt(N))
    Bsq= A*A-N
    BsqTest= m.sqrt(Bsq)
    while int(BsqTest)!=BsqTest:
        A= A+1
        Bsq= A*A-N
        BsqTest= m.sqrt(Bsq)
    return (A-BsqTest, A+BsqTest)