Need Hints for Yalalovichik Strings (Problem Code: YVSTR)?

Can Some One Shower Some hints for the following question?
Question: https://www.codechef.com/COOK101A/problems/YVSTR

Only substrings of form aaa or aabbb needs to be considered

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Nope ,“aabaa” has a subsequence “aaaa” but not a substring …

Yeah, you’re right. I completely overlooked that.

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