a,b,c = map(int,input().split())
d = b * b - 4 * a * c

if  a == b == 0 :
    print("0")
elif a == 0 and b != 0 and c != 0 :
    ptint("1")
    print((c / -b))
elif a == 0 and c == 0 and b!= 0 :
    print("1")
    print(1/b)
elif d >= 0:
    d **= 1/2
    r1 = (-b - d) / (2 * a)
    r2 = (-b + d) / (2 * a)
    if r1 == r2:
        print("1")
        print(format(r1, '.5f'))
    else:
        print("2")
        print(format(r1,'.5f'))
        print(format(r2,'.5f'))
elif d < 0 :
    print("0")

