true if R is reflexive relation; false if R is not reflexive relationWrite in Python:

$-$ the selected function

$-$ the appropriate program

The function:

$-$ may print$/$report only errors

$-$ should not print the computed value.

$-$ should return the computed value.

The program:

$-$ Input$/$read input data from the keyboard

$-$ call and execute the selected function

$-$ output$/$print result$($s$)/$output data at the screen

The function$($s$)$ and program must be into two separate python files.

The function$($s$)$ and program must be designed from scratch.

It is not allowed to use standard and library functions.

A character is $$a decimal digit$,$an upper$-$case letter$,$ or $$a lower$-$case letter$.$

A string is a sequence of characters.

A set is a collection of no duplicate elements.

An element is a string.