import sys
sys.setrecursionlimit(1000000000)

#
# Solution Template for Election II
# 
# Australian Informatics Olympiad 2022
# 
# This file is provided to assist with reading of input and writing of output 
# for the problem. You may modify this file however you wish, or
# you may choose not to use this file at all.
#

# N is the number of votes.
N = 0

# votes contains the sequence of votes.
votes = ""

answer = None

# Read the value of N and the votes.
N = int(input().strip())
votes = input().strip()

# TODO: This is where you should compute your solution. Store the winning
# candidate ('A', 'B' or 'C'), or 'T' if there is a tie, into the variable
# answer.

# Write the answer.
print(answer)