a,b,c = map(int,input().split())

d = b * b - 4 * a * c
if a == 0 and b == 0 :
    print("-1")
if a == 0:
    print("1")
    print(c / -b)

elif d == 0:
    print("1")
    print(( - b + d ** (1/2)) /(2*a) )
elif d < 0 :
    print("0")
elif d > 0 :
    print("2")
    print((-b + d ** (1/2)) / (2*a) )
    print((-b - d ** (1/2)) / (2*a) )