import java.util.LinkedHashMap;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static java.util.stream.Collectors.joining;

public class Demo {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

     String messege = scanner.nextLine();
        Pattern pattern = Pattern.compile("(@|#)(?<first>[A-Za-z]{3,})(\\1){2}(?<second>[A-Za-z]{3,})(\\1)");
        Matcher matcher = pattern.matcher(messege);
        LinkedHashMap<String,String> mirror = new LinkedHashMap<>();

        int pairCount = 0;

        while(matcher.find()){
            pairCount++;
            String first = matcher.group("first");
            String second = matcher.group("second");
            StringBuilder reverse = new StringBuilder(first);
            String compare = reverse.reverse().toString();

            if (compare.equals(second)){
                mirror.put(first, second);
            }
        }

        if (pairCount > 0){
            System.out.printf("%d word pairs found!%n", pairCount);
        }else {
            System.out.println("No word pairs found!");
        }
        if (mirror.size() > 0){
            System.out.println("The mirror words are:");

            String s = mirror.entrySet()
                    .stream()
                    .map(e -> e.getKey()+" <=> "+ e.getValue())
                    .collect(joining(", "));
            System.out.println(s);
        }else {
            System.out.println("No mirror words!");
        }
    }
    }