def f(x):
    return a*x**2+b*x+c
    
def binary_search1(l, r):
    left, right = l, r
    
    while right-left>=1e-15:
        mid = (left+right)/2
        
        if f(mid)>=0:
            right = mid
        else:
            left = mid
    
    return left

def binary_search2(l, r):
    left, right = l, r
    
    while right-left>=1e-15:
        mid = (left+right)/2
        
        if f(mid)<=0:
            right = mid
        else:
            left = mid
    
    return left
    
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("{:.15f}".format(-c/b))
else:
    if b**2-4*a*c>0:
        print(2)
        if a>0:
            ans1 = binary_search1(-b/2/a, 10**100)
            ans2 = binary_search2(-10**100, -b/2/a)
        else:
            ans1 = binary_search2(-b/2/a, 10**100)
            ans2 = binary_search1(-10**100, -b/2/a)
            
        print("{:.15f}".format(ans2))
        print("{:.15f}".format(ans1))
    elif b**2-4*a*c==0:
        print(1)
        print("{:.15f}".format(-b/(2*a)))
    else:
        print(0)