import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        Map<String,Integer> m=new HashMap<>();
        m.put("a",1);
        m.put("b",4);
        m.put("c",5);
        Iterator<String> it=m.keySet().iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
        Iterator<Integer> it2=m.values().iterator();
        while(it2.hasNext()){
            System.out.println(it2.next());
        }
        for(Map.Entry<String,Integer> m_val:m.entrySet()){
            System.out.println(m_val.getKey()+" "+m_val.getValue());
        }
        m.put("a",m.get("a")+1);
        for(Map.Entry<String,Integer> m_val:m.entrySet()){
            System.out.println(m_val.getKey()+" "+m_val.getValue());
        }
    }
}