import sys
from decimal import *
a, b, c=map(int, input().split())
if a==0:
    if b==0:
        if c==0:
            print(-1)
        else:
            print(0)
    else:
        print(1)
        print('{:.12g}'.format(-c/b))
    sys.exit()
if a<0:
    a=-a
    b=-b
    c=-c
d=b*b-4*a*c
if d<0:
    print(0)
elif d==0:
    print(1)
    print('{:.12g}'.format(-b/(2*a)))
else:
    print(2)
    a1=Decimal(a)
    b1=Decimal(b)
    c1=Decimal(c)
    d1=Decimal(d)
    ans1=(-b1-Decimal.sqrt(d1))/(2*a1)
    ans2=(-b1+Decimal.sqrt(d1))/(2*a1)
    print(ans1)
    print(ans2)