Most Common Letter, the Slow Way

The spy counts which letter a secret message uses most — with pencil and paper, no fancy tools. 🕵️

You get a lowercase word (at least one letter). Print its most common letter. On a tie, print whichever tied letter appears FIRST in the word. (No dictionaries — count each letter with loops.)

Example:

Input: word = "banana" Output: a

Counting each letter gives b=1, a=3, n=2 — "a" appears the most.