from math import sqrt
from sys import stdin
input=stdin.readline()
input=map(float,input.split(' '))
x=input[1]**2-4*input[0]*input[2]
if(x<0):
        print 0
elif(input[0]==0 and input[1]==0):
        print 0
elif (input[0]==0 and input[1]==0 and input[2]==0):
        print -1
else:
        m=(-1*input[1]+sqrt(x))/2*input[0]
        n=(-1*input[1]-sqrt(x))/2*input[0]
        print 2
        if (m>n):
                print  "%.7f" %n
                print  "%.7f" %m
        else:
                print  "%.7f" %m
                print "%.7f" %n
        #print (-1*input[1]-sqrt(x))/2*input[0]
