import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def red(a, b, c):
    x, y, z = abs(a), abs(b), abs(c)
    while y != 0: x, y = y, x % y
    while z != 0: x, z = z, x % z
    return (a // x, b // x, c // x)

def main():
    a, b, c = MI()
    if a == 0:
        if b == 0:
            if c == 0:
                print(-1)
            else:
                print(0)
        else:
            print(1)
            print(-c / b)
        exit()
    a, b, c = red(a, b, c)
    D = b ** 2 - 4 * a * c
    if D > 0:
        ax=-b/2/a
        w=(D/4/a)**0.5
        print(2)
        print(ax-w)
        print(ax+w)
    elif D == 0:
        print(1)
        print(-b / a / 2)
    else:
        print(0)
main()