Prasad, I enjoyed thinking through the pattern to solve this problem and the related problem. One suggestion for both is to add more test cases so that solvers cannot simply write their codes to return the answer to the single test case.
Needs more test cases.
Generate a string like abbcccddddeeeee
Count up then down
Number of o rderd pairs of integers (I,J) that can be formed.
Four digit number ABCD reversal
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