Problem: Let's call a string adorable if its letters can be realigned in such a way that they form two consequent groups of equal symbols (note that different groups must contain different symbols). For example, ababa is adorable (you can transform it to aaabb, where the first three letters form a group of a-s and others — a group of b-s), but cccc is not since in each possible consequent partition letters in these two groups coincide.

You're given a string s. Check whether it can be split into two non-empty subsequences such that the strings formed by these subsequences are adorable. Here a subsequence is an arbitrary set of indexes of the string.

Input

The only line contains s (1 ≤ |s| ≤ 105) consisting of lowercase latin letters.

Output

Print «Yes» if the string can be split according to the criteria above or «No» otherwise.

Each letter can be printed in arbitrary case.

Examples

Input

ababa


Output

Yes


Input

zzcxx


Output

Yes


Input

yeee


Output

No

Note

In sample case two zzcxx can be split into subsequences zc and zxx each of which is adorable.

There's no suitable partition in sample case three.

Solution (in JAVA):

Solution:
/* package codechef; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
public class Codechef
{
    long MOD = 1000000007L;
    int INF = 1000000000;
    int[] dX = new int[]{-1, 0, 1, 0};
    int[] dY = new int[]{0, 1, 0, -1};
    
    public class Obj implements Comparable<Obj>{
        public int start;
        public int end;
        
        public Obj(int start_, int end_){
            this.start = start_;
            this.end = end_;

        }
        
        public int compareTo(Obj other){
            if (other.start == this.start){
                return this.end - other.end;
            }
            return this.start - other.start;
        }

    }
    
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
        Codechef cf = new Codechef();
        cf.Solve();
	}
	
	public void Solve(){
        MyScanner sc = new MyScanner();
        String s = sc.nextLine();
        char[] arr = s.toCharArray();
        int n = arr.length;
        if (n < 4){
            System.out.println("No");
        }else{
            int[] cnt = new int[26];
            int num = 0;
            for (char c : arr){
                int idx = (int)(c - 'a');
                if (cnt[idx] == 0){
                    num++;
                }
                cnt[idx]++;
            }
            
            if (num > 4){
                System.out.println("No");
            }else if (num > 2){
                System.out.println("Yes");
            }else if (num == 2){
                for (int i = 0; i < 26; ++i){
                    if (cnt[i] == 1){
                        System.out.println("No");
                        return;
                    }
                }
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }
        }
	}
	
	public boolean inside(int x, int y, int n, int m){
	    return (x >= 0 && x < n && y >= 0 && y < m);
	}
	
	//-----------PrintWriter for faster output---------------------------------
   public static PrintWriter out;
      
   //-----------MyScanner class for faster input----------
   public static class MyScanner {
      BufferedReader br;
      StringTokenizer st;
 
      public MyScanner() {
         br = new BufferedReader(new InputStreamReader(System.in));
      }
 
      String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
      try {
         str = br.readLine();
      } catch (IOException e) {
         e.printStackTrace();
      }
      return str;
      }

   }
}