import javautilHashMap;import javautilScanner;public class Main public static void mainString args Scanner in = new ScannerSystemin; String lines = innextLinesplit ; HashMapS

import collections

lines = input().split(" ") cnts = collections.defaultdict(int) for line in lines: cnts[line] += 1

for s, count in cnts.items(): if count >= 3: print(s)