a,b,c = map(float,raw_input().split(" "))
import math
delta = b*b-4*a*c
if delta<0:
    print -1
else:
    if delta == 0:
        print 1
        print '%.6f'%(-b/(2*a))
    else:
        print 2
        x1,x2 = (-b+math.sqrt(delta)) /2*a,(-b-math.sqrt(delta)) /2*a
        if x1>x2:
            x1,x2 = x2,x1
        print '%.6f'%x1
        print '%.6f'%x2


	   				 	    		      		 	  		