I have found this puzzle on the internet but I didn't get any answer yet, so help me out.

For rules see the given image:


Here you can either give clues or may explain your answer.


The answer is



the right-hand side is the last letter of the sum of all digits on the left-hand side. Thus 1111 -> FOUR, 2222 -> EIGHT, 3333 -> TWELVE, 4444 -> SIXTEEN, 5555 -> TWENTY.


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