import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

public class JI9051296 {

	public static void main(String[] args) {
		Map<String, String> x = new TreeMap<>(); 
		x.put("a", "1"); 
		x.put("b", "2"); 
		x.put("c", "3"); 
		Iterator<Map.Entry<String, String>> i = x.entrySet().iterator(); 
		Map.Entry<String, String> y = i.next(); 
		y = i.next(); 
		System.out.println("before " + y.getKey()); 
		i.remove(); 
		System.out.println("after " + y.getKey()); 

	}

}