import math
from decimal import *


def main():
    a, b, c = map(Decimal, map(int, input().split()))
    if a == 0:
        if b == 0:
            if c == 0:
                print(-1)
            else:
                print(0)
        else:
            print(1)
            print(f"{-c / b:.30f}")
    else:
        d = b * b - 4 * a * c
        if d < 0:
            print(0)
        else:
            if d != 0:
                p = -b
                q = Decimal(d).sqrt()
                r = 2 * a
                print(2)
                x1 = (p - q) / r
                x2 = (p + q) / r
                if x1 > x2:
                    x1, x2 = x2, x1
                print(f"{x1:.30f}")
                print(f"{x2:.30f}")
            else:
                print(1)
                print(f"{(-b) / (2 * a):.30f}")


if __name__ == "__main__":
    main()