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

public class Main
{
	public static void main(String [] Args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
}
	 import java.util.*; util.* java import java.io.*; io.* java public class Main
{
	public static void main(String [] Args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} Main public static void main(String [] Args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} main {
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	} Scanner in=new Scanner(System.in); in new Scanner(System.in) String s=in.next(); s in.next() in.next in if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		} s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2) s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2) s.charAt(0)!=s.charAt(1) s.charAt(0) s.charAt s 0 s.charAt(1) s.charAt s 1 s.charAt(0)!=s.charAt(2) s.charAt(0) s.charAt s 0 s.charAt(2) s.charAt s 2 s.charAt(1)!=s.charAt(2) s.charAt(1) s.charAt s 1 s.charAt(2) s.charAt s 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 in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} public class Main
{
	public static void main(String [] Args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
} Main
import java.util.*;
import java.io.*;

public class Main
{
	public static void main(String [] Args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		if(s.charAt(0)!=s.charAt(1)||s.charAt(0)!=s.charAt(2)||s.charAt(1)!=s.charAt(2))
		{
			System.out.println("Yes");
		}
		else
		{
			System.out.println("No");
		}
	}
}
	