import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.HashSet;import java.util.Set;public class ChongChong { public static void main(String[] args) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int N = Integer.parseInt(br.readLine()); Set s = new HashSet(); s.add("..
