from math import *

a, b, c = map(int, input().split())
if a == 0:
    if b == 0:
        if c == 0:
            print(-1)
        else:
            print(0)
    else:
        print(1)
        print(-c/b)
else:
    D = b * b - 4 * a * c
    if D > 0:
        x = (-b - sqrt(D))/(2 * a)
        y = -2 * c / (b + sqrt(D))
        print(2)
        print(x)
        print(y)
    elif D == 0:
        print(1)
        print(-b/(2 * a))
    else:
        print(0)