import sys
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)
    sys.exit()
if a<0:
    a=-a
    b=-b
    c=-c
d=b*b-4*a*c
if d<0:
    print(0)
elif d==0:
    print(-b/(2*a))
else:
    print(2)
    n=10**12
    b*=n
    c*=n*n
    l=int(-b/a)
    r=2*(10**21)
    while r-l>1:
        m=(l+r)//2
        if a*m*m+b*m+c<=0:
            l=m
        else:
            r=m
    ans=l/n
    b//=n
    print(-b/a-ans)
    print(ans)