a,b,c=map(int,input().split())
import math
l=[]
p=(b**2-4*a*c)
if p<0:
    print("-1")
if p==0:
    count=1
    x=(-b)/(2*a)
    l.append(x)
if p>0:
    count=2
    x=(-b+(b**2-4*a*c)**0.5)/2*a
    l.append(x)
    x=(-b-(b**2-4*a*c)**0.5)/2*a
    l.append(x)
l.sort()
for i in l:
    print('%.5f' %i)
    
