import math

a, b, c = map(int, input().split())
try:
    if a == 0:
        if b == 0 and c == 0:
            print(-1)
        elif b == 0 and c != 0:
            print(0)
        else:
            x = -b/a
            print(1)
            print('{:.10f}'.format(x))
    else:
        delta = pow(b, 2) - (4 * a * c)
        if delta < 0:
            print(0)
        elif delta == 0:
            x = -b / (2 * a)
            print(1)
            print('{:.10f}'.format(x))
        else:
            x1 = (-b - math.sqrt(delta)) / (2 * a)
            x2 = (-b + math.sqrt(delta)) / (2 * a)
            print(2)
            print('{:.10f}'.format(x1))
            print('{:.10f}'.format(x2))
except:
    print(0)