import math
a, b, c = map(float, input().split())

if a == 0:
    if b == 0:
        print(0 if c!=0 else -1)
    else:
        print(1)
        print(-c/b)
else:
    d = b*b-4*a*c
    if d < 0:
        print(0)
    elif d == 0:
        print(1)
        print(-b/a/2)
    else:
        f = math.sqrt(d)
        x,y = (-b-f)/a/2, (-b+f)/a/2
        if x > y: x,y = y,x
        print(2)
        print(x)
        print(y)