from decimal import Decimal, getcontext
getcontext().prec = 17

a, b, c = map(int, input().split())
A, B, C = map(Decimal, [a, b, c])

if a==0:
    if b==0 and c==0: print(-1);
    elif b==0 and c!=0: print(0);
    else:
        print(1);
        print(-C/B);
else:
    if b*b-4*a*c < 0: print(0);
    elif b*b-4*a*c == 0:
        print(1)
        print(-B/(2*A))
    else:
        if B < 0:
            A, B, C = -A, -B, -C
        print(2)
        x1 = (-B-(B*B-4*A*C).sqrt())/(2*A)
        x2 = (2*C)/(-B-(B*B-4*A*C).sqrt())
        print(min(x1, x2))
        print(max(x1, x2))