def mysqrt(x):
    ok = 1
    ng = 10**500
    while ok + 1 < ng:
        m = (ok + ng) // 2
        if m * m <= x:
            ok = m
        else:
            ng = m
    return ok

a, b, c = map(int, input().split())
if a == 0:
    if b == 0:
        print(-1 if c == 0 else 0)
    else:
        print(1)
        print(-c / b)
else:
    if a < 0:
        a, b, c = -a, -b, -c
    p = b * b - a * c * 4
    if p == 0:
        print(1)
        print(-0.5 * b / a)
    elif p > 0:
        f = 10 ** 100
        a *= f ** 2
        b *= f
        p = b * b - a * c * 4
        s = -0.5 * (mysqrt(p) + b) / a
        t = 0.5 * (mysqrt(p) - b) / a
        print(2)
        print(s * f)
        print(t * f)
    else:
        print(0)