T7. More often than others#10079
Given a non-empty string composed solely of letters from the Latin alphabet, identify the letter that occurs most frequently. Treat uppercase and lowercase versions of the same letter as identical. If there is a tie, select the letter that appears first in alphabetical order. Present your answer in uppercase.
The input consists of a single line containing the string. The input string's length will not exceed characters.
Output a single line with the solution to the problem.
Example 1
Example 2