shi ta plesna

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.LinkedHashMap;
import java.util.Map;

public class Veronika {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String line = reader.readLine();

        LinkedHashMap<Character, Integer> symbolCount = countSymbols(line);

        int max = -1;
        char maxCh = 'a';
        for (Map.Entry<Character, Integer> entry : symbolCount.entrySet()) {
            if (entry.getValue() > max) {
                max = entry.getValue();
                maxCh = entry.getKey();
            }
        }

        if (max > 1){
            //TODO CHANGE THE WORD
        }
    }

    private static LinkedHashMap<Character, Integer> countSymbols(String line) {
        LinkedHashMap<Character, Integer> counter = new LinkedHashMap<>();

        for (char ch : line.toCharArray()) {
            if (counter.containsKey(ch)) {
                counter.put(ch, counter.get(ch) + 1);
            } else {
                counter.put(ch, 1);
            }
        }

        return counter;
    }
}