import sys

from decimal import Decimal, localcontext

from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    a, b, c = vi()
    with localcontext() as ctx:
        ctx.prec = 100
        if a == 0:
            if b == 0:
                if c == 0:
                    print(-1)
                else:
                    print(0)
            else:
                print(1, - Decimal(c) / Decimal(b), sep='\n')
        else:
            D = b * b - 4 * a * c
            if D == 0:
                print(1, -Decimal(b) / (2 * Decimal(a)), sep='\n')
            elif D < 0:
                print(0)
            else:
                sqrtD = Decimal.sqrt(Decimal(D))
                s1 = (-b - sqrtD) / (2 * a)
                s2 = (-b + sqrtD) / (2 * a)
                print(2, s1, s2, sep='\n')


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()