Write a program to multiply two polynomials. We will represent a polynomial by a sequence of its coefficients. For example, we will use $(1, 2, 3)$ to represent $x^2 + 2x + 3$, and $(4, 5, 6, 7)$ for $4 x^3 + 5 x^2 + 6x + 7$.
The number of coefficients in a polynomial is no more than 100. The coefficients are positive and no more than 100.
There are four lines in the input. The first line is a positive integer $n$, the number of coefficients of the first polynomial $f(x)$. The second line has $m$ integers for the coefficients of the second polynomial $g(x)$. Similarly the third line and fourth line are for the second polynomial.
The coefficients of the product of the two input polynomials $f(x)g(x)$.
1 2 3
4 5 6 7
4 13 28 34 32 21