Write a program to get a users integer input for the number of lines (ranging from 2 to 9), and then print a triangular pattern of numbers by a nested for loop. For example, if the users input is 5, the pattern should look like:

12345

1234

123

12

1

If the users input is 8, the pattern should look like:

12345678

1234567

123456

12345

1234

123

12

1