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(input[0]==0 and  input[2]!=0 and input[1]!=0):
        print 1
        #print "kjkjkjjj"
        d=-input[2]/input[1]
        print "%.6f" %d
#elif(input[0]!=0 and  input[2]==0 and input[1]==0):
        #print 2
        #print '0.00000000'
        #print '0.00000000'
elif(input[0]==0 and  input[1]!=0 and input[2]==0):
        print 1
        print "0.00000000"
        
elif(input[0]==0 and input[1]==0 and input[2]!=0):
        
        print 0
elif (input[0]==0 and input[1]==0 and input[2]==0):
        print -1
elif x>=0:
        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]
elif x<0:
        print 0
