#!/bin/python3

import math
import os
import random
import re
import sys
from collections import Counter


if __name__ == '__main__':

    # Sample large text
    text = sys.stdin.read()

    pattern = r'[\r\n]'
    cleaned_text = re.sub(pattern, '', text)

    pattern = r'(?=(\b[a-z]+\s[a-z]+\s[a-z]+\b))'
    # Find all matches
    matches = re.findall(pattern, cleaned_text.lower())

    #print(matches)
    # Count the number of matches using Counter
    match_counts = Counter(matches)

    #get the first value with highest number
    result = ""
    max_num = 0

    for match, count in match_counts.items():
        #print(match, max_num, count)
        if max_num < count:
            result = match
            max_num = count

    print(result.strip())