a,b,c=map(int,input().split())

import math
ANS=[]

if a!=0:
    if b**2-4*a*c>0:
        print(2)
        ANS.append((-b+math.sqrt(b**2-4*a*c))/(2*a))
        ANS.append((-b-math.sqrt(b**2-4*a*c))/(2*a))

        print(*sorted(ANS))

    elif b**2-4*a*c==0:
        print(1)
        print(-b/(2*a))

    else:
        print(0)

else:
    if b!=0:
        print(1)
        print(-c/b)

    else:
        if c==0:
            print(-1)
        else:
            print(0)