Shiku Gets Lucky

One day while playing, Shiku found a sequence of lowercase English letters. Shiku thought it might be an ancient sequence and he could become rich by selling it. He knows that for the sequence to be ancient, there must be a character that occurs more than the half times the length of sequence. But as Shiku is useless, he failed to do even this simple task. So, he asks for your help now. As you are his good friend (?), now you have to determine if it’s his lucky day.

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