Implement and test a Fortran 90 program which has the following features:

1. When the user runs the program he/she gets the following displayed on the screen:

Enter a character string (MyString) of length less than or equal to 50:

2. After the user enters a value for MyString (the character string will be assigned to a variable called MyString.), the program searches MyString for the segment iat. If iat is a part of MyString, then the program displays Yes. Otherwise, it displays No. This step has to be performed by a function called StringSearch.

3. Then, the program displays the following:

Continue? If not, press n or N, else press any other key.

If the user hits n or N, then the program stops running. If the user hits any other key, the program repeats the whole process (i.e. goes back to step #1.)