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Coding/Data and ML code

Decode run-length

Write codeEasy10 min

Your task

A telemetry beacon sends status strings compressed as letter-count pairs: each lowercase letter is followed by a single digit from 1 to 9 saying how many times it repeats. Decode the transmission back to its expanded form. The input's length is always even and well-formed, and it may be empty. For example, 'a3b1' expands to 'aaab'.

Examples

rle_decode(encoded: str) -> str
Example 1
Inputrle_decode("a3b1")
Output"aaab"