P2379 Polynomial Calculation [Incorrect testdata]

Xiao Ming has started middle school. He keeps making mistakes in polynomial calculations, so he turned to you, a programming enthusiast, to design a program to help him.

Input several monomials or polynomials and compute the result.

The expression includes +, -, \*, and letters (only the 26 lowercase letters a to z). A monomial has no surrounding brackets; a polynomial is enclosed in ( ) or [ ]. It is guaranteed that, within each multiplicative factor, monomials come before polynomials. The length does not exceed 255.

Output the result of the expression, with each factor arranged in lexicographic order.

A simple problem. Translated by ChatGPT 5