Word with x or y

Write a function $with\_x\_y(ls)$ that receives a list of arbitrary strings and returns the first character of the first string in the list that has either the lowercase letter ’x’ or the lowercase letter ’y’ in it; if no such word occurs in the list, it returns the empty string.

Problem information

Author: José Luis Balcázar

Generation: 2026-01-25T16:05:52.012Z