"I do believe in simplicity. It is astonishing as well as sad, how many trivial affairs even the wisest thinks he
must attend to in a day; how singular an affair he thinks he must omit. When the mathematician would solve a
difficult problem, he first frees the equation of all incumbrances, and reduces it to its simplest terms. So
simplify the problem of life, distinguish the necessary and the real. Probe the earth to see where your main roots
run."

-― Henry David Thoreau

In mathematics, a polynomial is an expression consisting of variables (or indeterminates) and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents.

You are given a mathematical expression.... You should convert this to a Polynomial. The power of "x" should be represented by "**".