import sys

sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


a,b,c = MI()

if a == 0:
    if b != 0:
        print(1)
        print(-c/b)
    else:
        if c == 0:
            print(-1)
        else:
            print(0)
elif b**2 > 4*a*c:
    if a < 0:
        a,b,c = -a,-b,-c

    e = 10**-11

    pos = -10**10
    neg = -b/(2*a)
    while neg-pos >= e:
        mid = (pos+neg)/2
        if a*mid**2+b*mid+c > 0:
            pos = mid
        else:
            neg = mid
    sol0 = pos

    pos = 10**10
    neg = -b/(2*a)
    while pos-neg >= e:
        mid = (pos+neg)/2
        if a*mid**2+b*mid+c > 0:
            pos = mid
        else:
            neg = mid
    sol1 = pos

    print(2)
    print(sol0)
    print(sol1)

elif b**2 == 4*a*c:
    print(1)
    print(-b/(2*a))
else:
    print(0)