Hieroglyphs.java

package timus;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Created by sherxon on 12/5/16.
 */
public class Hieroglyphs {
    public static void main(String[] args) {
        FastReader reader= new FastReader();
        int n=Integer.parseInt(reader.nextLine());
        Map<Character, Set<Character>> setMap= new HashMap<>();
        for (int i = 0; i < n; i++) {
            String s=reader.nextLine();
            if(!setMap.containsKey(s.charAt(0)))
                setMap.put(s.charAt(0), new HashSet<>());
            setMap.get(s.charAt(0)).add(s.charAt(1));
        }
        char r=reader.nextLine().charAt(0);
        if(setMap.containsKey(r))
        for (Character character : setMap.get(r)) {
            System.out.println(String.valueOf(r)+String.valueOf(character));
        }
    }

}