import java.util.*;
 
public class Main {
 	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    }
} import java.util.*; util.* java public class Main {
 	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    }
} Main public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    } main {
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc String[] strArray = new String[S.length()]; strArray new String[S.length()] S.length() S.length S for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		} int i = 0; int i = 0; i 0 i < S.length() i S.length() S.length S i++ i++ i {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		} {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		} String str2 = String.valueOf(S.charAt(i)); str2 String.valueOf(S.charAt(i)) String.valueOf String S.charAt(i) S.charAt S i strArray[i] = str2 strArray[i] strArray i str2 if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            } i>0 i 0 {
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            } if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                } !(strArray[i].equals(strArray[i-1])) (strArray[i].equals(strArray[i-1])) strArray[i].equals strArray[i] strArray i strArray[i-1] strArray i-1 i 1 {
                	System.out.println("Yes");
                	return;
                } System.out.println("Yes") System.out.println System.out System System.out "Yes" return; System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {
 	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    }
} public class Main {
 	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    }
} Main
import java.util.*;
 
public class Main {
 	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
        String S = sc.next();
      	String[] strArray = new String[S.length()];
      
      	for (int i = 0; i < S.length(); i++) {
    		String str2 = String.valueOf(S.charAt(i));
      		strArray[i] = str2;
          	if(i>0){
            	if(!(strArray[i].equals(strArray[i-1]))){
                	System.out.println("Yes");
                	return;
                }
            }
		}
      	System.out.println("No");
    }
}