Tapa Logic (Mini Puzzles Series #38)

This puzzle type appeared in Oguz Atay Puzzle Contest (OAPC) and the 18th World Puzzle Championship, Antalya (Turkey) and I created it in the year 2009 for the practice of the Indian Puzzle Team participating in the World Puzzle Championship 2009. There is one more puzzle of this type which I will be posting soon.

I am re-posting this Tapa Logic as the 38th puzzle in Mini Puzzles Series. Can you solve this Tapa Logic puzzle?

Rules of Tapa Logic puzzle

Paint some squares black to create a continuous wall. The number (s) in a square indicates the length of black cell blocks on its neighboring cells. If there is more than one number in a square, there must be at least one white cell between the black cell blocks. Painted cells cannot form a 2x2 square or larger field. There are no wall segments on cells containing the encrypted letters.

Each letter given in the puzzle is encrypted with a digit given in the range. The same letters mean the same digit, and different letters mean different digits.