Compress the Chant

The crowd chants 'aaabb' — the sports reporter writes 'a3b2'. Build the compressor! 🗜️

You get a chant (lowercase letters). Replace each run of repeated letters with the letter followed by its count (even a count of 1). Print the compressed form.

Example:

Input: chant = "aaabb" Output: a3b2

"a" repeats 3 times in a row, then "b" repeats 2 times — writing each letter with its run-length gives a3b2.