class equation:
    
    def count(self, a, b, c):
        if a != 0:
            D = b**2-4*a*c
            if D == 0:
                print(1)
                print(-(b/(2*a)))
                return -b/(2*a)
            elif D > 0:
                if b < 0:
                    x1 = (-b + (D)**0.5)/(2*a)
                    x2 = c/(a*x1)
                else:
                    x2 = (-b - (D)**0.5)/(2*a)
                    x1 = c/(a*x2)
                x = [x1,x2]
                x.sort()
                print(2)
                print(x[0])
                print(x[1])
                return x
            else:
                print(0)
                return 0

        else:
            if b !=0:
                x = -(c/b)
                print(1)
                print(x)
                return x
            else:
                if c == 0:
                    print(-1)
                    return -1
                else:
                    print(0)
                    return 0
a, b, c = map(int,input().split(" "))
ans = equation()
ans.count(a,b,c)