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<!--info-header-start--><h1>Run-length encoding </h1><blockquote><p>by Hen Hedymdeith <a href="https://github.com/alfaproxima" target="_blank">@alfaproxima</a></p></blockquote><p><a href="https://tsch.js.org/14188/play" target="_blank"></a> </p><!--info-header-end-->

Given a string sequence of a letters f.e. AAABCCXXXXXXY. Return run-length encoded string 3AB2C6XY. Also make a decoder for that string.

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