This is the Hindi letter S as in Surf and this is the letter N as in NuN. . You can make similar lessons yourself by using a Devanagri font. Paste them into a windows paintbrush program using the text tool and save as a monochrome bitmap file. Open this file in thumbs or paint shop pro and save as a gif file. For really large letters you need Universal word program.
Lets look at more letters.
This is the letter K as in stucK-note all Hindi letters have a line on top and only the short sound is pronounced . . If you got it right -well done . Award yourself a brownie point. Now learn another letter making the R sound as in Rum. 1 point for each correct answer.