from decimal import *

a,b,c = [Decimal(int(x)) for x in raw_input().split()]

def solve():
    if (a==0 and b==0):
        print(-1 if (c==0) else 0)
        return

    if (a==0):
        print(1)
        ans = -c/b
        print("{:.16f}".format(ans))
        return

    border = Decimal(b*b - 4 * a * c)
    if (border < 0):
        print(0)
        return

    if (border == 0):
        print(1)
        ans = -b / Decimal(2) / a
        print("{:.16f}".format(ans))
        return

    q = border.sqrt()
    ans0 = (-b + q) / Decimal(2) / a
    ans1 = (-b - q) / Decimal(2) / a
    print(2)
    print("{:.16f}".format(min(ans0, ans1)))
    print("{:.16f}".format(max(ans0, ans1)))

solve()