a, b, c = map(int, input().split())
d = b**2 - 4*a*c
if a == 0:
    if b == 0:
        print("1\n0" if c == 0 else "0")
    else:
        print("1\n{}".format(-c / b) if b != 0 else "0")
elif d < 0:
    print(0)
elif d == 0:
    print(1)
    print(-b / (a * 2))
else:
    print(2)
    print((-b - d**0.5) / (a * 2))
    print((-b + d**0.5) / (a * 2))