Letter exchanger

Write a Python program that asks the user for a word \(p\) and it returns in the output another word in which the first and last characters of \(p\) have been exchanged. Use the chain cutter operator. Run the following tests to test the operation of your program:

test case ID	input	expected output
1	""	""
2	"a"	"a"
3	"ab"	"ba"
4	"ab ba"	"ab ba"

Insist that the students test their programs by giving them a table
of test cases.