from decimal import Decimal, getcontext
getcontext().prec = 100

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*b < 0: print(0);
    elif b*b-4*a*b == 0:
        print(1)
        print(-B/(2*A))
    else:
        print(2)
        print((-B-(B*B-4*A*C).sqrt())/(2*A))
        print((-B+(B*B-4*A*C).sqrt())/(2*A))