Home work: $1.$ Input a number. Find all the factors of that number and store them in stack. $2.$ Input a string and reverse it using stack. $3.$ Input a number and check whether all the digits of that number are unique or not. $4.$ Input a number. Starting from $1$ to that number find all the prime numbers. $5.$ Write a program that lets the user type some text, consisting of words separated by blanks, ending with a carriage return, and displays the text in the same word order as entered, but with the letters $$in each word reversed. For example, "this is a test" becomes "siht si a tset".