3. (25 pts) Define a function that takes a string as a parameter and returns a modified version of this string such that its first and last characters will be swapped. Some examples are the following: Given the string argument "abcde" the function will return "ebcda"; given "x" the function will return "x"; given "PPP" the function will return "PPP"; given "SE113" the function will return "3E11S". In your Python script, test your function by passing an argument value and then print out the value returned