Write a Python script to calculate the zeros of a quadratic equation. You should prompt the user to enter the equation in the form y = x**2 + sBBx + sCC, where sBB and sCC are the last two coefficients of the equation, written with a sign (+ or -) and two digits. The first coefficient must always be 1. For example, the equation y = x^2 - 2x + 1 would be entered as "y = x**2 + -02x + +01".

You can find the zeros of a quadratic equation using the quadratic formula: x1 = (-b + sqrt(b * b - 4 * c)) / 2 and x2 = (-b - sqrt(b * b - 4 * c)) / 2, where b and c are the last two coefficients of the quadratic equation. If the equation only has one zero (such as y = x^2 - 2x +1, which only has the zero x = 1), you should print that zero twice (basically, calculate x1 and x2 as normal). If the equation has no real zeros (such as y = x^2 + 1), you should print a message to that effect. If the quantity being square rooted (b^2 - 4ac) is negative, the equation will not have a real root.