Where's My Backpack?

The cubby wall at school is one long row, and every cubby holds one thing. 🎒

You get a list of items and your backpack is in there somewhere. Print which cubby it's in — but cubbies are numbered starting from 1, not 0!

Example:

Input: items = ["lunchbox", "coat", "backpack", "ball"] Output: 3

backpack sits at index 2 (the third position), but cubbies count from 1, so we print 2 + 1 = 3.