def solve_eq2(a,b,c):
    if b**2-4*a*c > 0:
        return [(-b-(b**2-4*a*c)**0.5)/(2*a), (-b+(b**2-4*a*c)**0.5)/(2*a)]
    elif b**2-4*a*c == 0:
        return [(-b)/(2*a)]
    else:
        return []
def solve_eq1(b,c):
    return -c/b
def solve_eq0(c):
    if c == 0:
        return -1
    else:
        return 0

a,b,c = map(int,input().split())
if a != 0:
    answer = solve_eq2(a,b,c)
    print(len(answer))
    for ans in answer:
        print(ans)
elif b != 0:
    print(1)
    print(solve_eq1(b,c))
else:
    print(solve_eq0)