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()

D = b**2-4*a*c

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

    sol0 = (-b-D**.5)/(2*a)
    sol1 = -b/a-sol0

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

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