The Lonely Glove

The lost-and-found gloves all match up into pairs — except ONE glove whose partner is truly gone. 🧤

You get the glove tags (every tag appears an even number of times, except one tag appearing an odd number of times). Print the lonely tag.

Example:

Input: tags = ["red", "blue", "red", "green", "blue"] Output: green

"red" and "blue" each appear twice (even), but "green" appears only once (odd) — the lonely tag.