Least Frequent Letters

Write a function lowfreq(w) that receives a nonempty word made up of
lowercase letters and returns all the letters from the word that attain
the lowest frequency in it. They should be provided as a single string,
and ordered by their standard alphabetical order.

Problem information

Author: José Luis Balcázar

Generation: 2026-01-25T17:41:30.017Z

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