import java.util.Scanner;
import java.util.Arrays;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

}
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

}
} Main public static void main(String[] args){
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

} main {
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

} Scanner scan=new Scanner(System.in); scan new Scanner(System.in) String s=scan.next(); s scan.next() scan.next scan String[] ss=s.split(""); ss s.split("") s.split s "" if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
} !(ss[0].equals(ss[1]))&&ss[1].equals(ss[2]) !(ss[0].equals(ss[1])) (ss[0].equals(ss[1])) ss[0].equals ss[0] ss 0 ss[1] ss 1 ss[1].equals(ss[2]) ss[1].equals ss[1] ss 1 ss[2] ss 2 {
  System.out.println("Yes");
} System.out.println("Yes") System.out.println System.out System System.out "Yes" if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
} ss[0].equals(ss[1])&&!(ss[1].equals(ss[2])) ss[0].equals(ss[1]) ss[0].equals ss[0] ss 0 ss[1] ss 1 !(ss[1].equals(ss[2])) (ss[1].equals(ss[2])) ss[1].equals ss[1] ss 1 ss[2] ss 2 {
  System.out.println("Yes");
} System.out.println("Yes") System.out.println System.out System System.out "Yes" if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
} !(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2])) !(ss[0].equals(ss[1])) (ss[0].equals(ss[1])) ss[0].equals ss[0] ss 0 ss[1] ss 1 !(ss[1].equals(ss[2])) (ss[1].equals(ss[2])) ss[1].equals ss[1] ss 1 ss[2] ss 2 {
  System.out.println("Yes");
} System.out.println("Yes") System.out.println System.out System System.out "Yes" {
  System.out.println("No");
} 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 scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

}
} public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

}
} Main
import java.util.Scanner;
import java.util.Arrays;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
String s=scan.next();
String[] ss=s.split("");
  
if(!(ss[0].equals(ss[1]))&&ss[1].equals(ss[2])){
  System.out.println("Yes");
}else if(ss[0].equals(ss[1])&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else if(!(ss[0].equals(ss[1]))&&!(ss[1].equals(ss[2]))){
  System.out.println("Yes");
}else{
  System.out.println("No");
}
  

}
}