Hi Rita,
This has to be done in the debugging mode of Keil only. And the code given to you works fine, there is no need to refine.

Did you follow the methods of debugging by Compiling and then pressing <Ctrl-F5> and then <F10>?
<Ctrl-F5> is the key to start/stop Debugging mode of Keil.
<F10> is the key used for single stepping during the debugging mode.
Keep on pressing <F10> sucessively, and you will see the contents of the array one after another in the window of P1 port.

What you should see in the window of P1 port:
After you execute the following code every time:

P1= Input[i][j];
 

The contents of window of P1 port will show : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,13, 14, 15.
If you download this program in the CPU and test it on the hardware, and if you connect a Logic analyzer to the 8 pins of P1, you will see the above array contents.

If you do not see this during debugging, then,
1. explain what you have done till now.
2. what did you see.
3. what do you expect to see.

Please explain the above 3 points very clearly, step-by-step.

Bye from Kiran V Sutar, Mumbai,INDIA