a,b,c=map(int,input().split())

import math
from decimal import *
getcontext().prec = 50
ANS=[]

if a!=0:
    if b**2-4*a*c>0:
        print(2)
        ANS.append((Decimal(-b)+Decimal(math.sqrt(b**2-4*a*c)))/Decimal(2*a))
        ANS.append((Decimal(-b)-Decimal(math.sqrt(b**2-4*a*c)))/Decimal(2*a))

        for a in sorted(ANS):
            print(a)

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

    else:
        print(0)

else:
    if b!=0:
        print(1)
        print(Decimal(-c)/Decimal(b))

    else:
        if c==0:
            print(-1)
        else:
            print(0)