from math import sqrt

a, b, c = map(int, input().split())
if a == 0 and b == 0 and c == 0:
    print(-1)
    exit()

d = b*b-4*a*c
if d < 0:
    print(0)
elif d == 0:
    print(1)
    print(-b/(2*a))
else:
    print(2)
    print((-b-sqrt(d))/(2*a))
    print((-b+sqrt(d))/(2*a))