## https://yukicoder.me/problems/no/955

import math

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

    if a == 0 and b == 0:
        if c == 0:
            print(-1)
        else:
            print(0)
    elif a == 0:
        print(1)
        print(-c / b)
    else:
        if a < 0:
            a *= -1
            b *= -1
            c *= -1

        d = b ** 2 - (4 * a * c)
        if d > 0:
            print(2)
            y = -b / (2 * a)
            def func(x):
                return a * (x ** 2) + b * x + c
            low = -10 ** 9
            high = y

            while high - low > 10 **(-11):
                mid = (high + low ) /2
                if func(mid) >= 0.0:
                    low = mid
                else:
                    high = mid
            print(low)


            low = y
            high = 10 ** 9
            while high - low > 10 **(-11):
                mid = (high + low ) /2
                if func(mid) >= 0.0:
                    high = mid
                else:
                    low = mid
            print(high)
        elif d == 0:
            print(1)
            print(-b / (2 * a))
        else:
            print(0)





if __name__ == '__main__':
    main()