## 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:
        d = b ** 2 - 4 * a * c
        if d > 0:
            print(2)
            a_p = (-b + math.sqrt(d)) / (2 * a)
            a_m =  (-b - math.sqrt(d)) / (2 * a)
            print(a_m)
            print(a_p)
        elif d == 0:
            print(1)
            print(-b / (2 * a))
        else:
            print(0)





if __name__ == '__main__':
    main()