## Task Description

Write a program to solve a system of equations.
In particular we are given an $n$ by $n$ upper triangular matrix $A$ and a $n$ by $1$ vector $y$, and we would like to find another $n$ by $1$ vector $x$ so that $Ax = y$.
Since $A$ is upper triangular, i.e., all the elements below the diagonal are zero, we can use a simple procedure called **backward substitution** to get the vector $x$.
Since $A_{n,n} \times x_n=y_n$, so we conclude that $x_n = y_n / A_{n,n}$.
Since we know $x_n$ now, we can easily compute $x_{n-1}$, then $x_{n-2}$, and so on, until we finally compute $x_1$.

## Input

The first line of the input has the number of rows and columns $n$. $n$ is between 1 and 16. Each of the following $n$ lines has $n$ double numbers in $A$. Each of the following $n$ lines has the numbers in $y$. Note that all elements of matrix and vector are double numbers.

## Output

The output has $n$ lines.
Each line is a number in $x$.
You should output the double numbers in `%f\n`

format.

## Sample input

`3`

`1.0 2.0 3.0`

`0.0 2.0 1.0`

`0.0 0.0 4.0`

`2.0`

`3.0`

`-4.0`

## Sample output

`1.000000`

`2.000000`

`-1.000000`