Create a Python solution to the following task. Ensure that the solution produces output in exactly the same format shown in the sample$($s$)$ below, including capitalization and whitespace.

Task:

Create a solution that accepts an input identifying the name of a text file, for example, "WordTextFile$1.$txt$".$ Each text file contains three rows with one word per row. Using the open$()$ function and write$()$ and read$()$ methods, interact with the input text file to write a new sentence string composed of the three existing words to the end of the file contents on a new line. Output the new file contents.

The solution output should be in the format

word$1$

word$2$

word$3$

sentence

Sample Input$/$Output:

If the input is

WordTextFile$1.$txt

then the expected output is

cat

chases

dog

cat chases dog