import decimal

a,b,c=map(int,input().split())
if a==0:
    if b==0:
        if c==0:
            print(-1)
        else:
            print(0)
    else:
        print(1)
        print(-c/b)
else:
    a=decimal.Decimal(a)
    b=decimal.Decimal(b)
    c=decimal.Decimal(c)
    d=b**2-4*a*c
    if d>0:
        x1=(-b+d.sqrt())/2/a
        x2=(-b-d.sqrt())/2/a
        if x1>x2: x1,x2=x2,x1
        print(2)
        print(x1)
        print(x2)
    elif d==0:
        print(1)
        print(-b/2/a)
    else:
        print(0)