import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	}

	static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	}
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	}

	static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	}
} Main public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	} main {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	} InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) A solver = new A(); solver new A() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	} A public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		} solve {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		} String input = in.next(); input in.next() in.next in boolean result = false; result false for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			} int i = 0; int i = 0; i 0 i < input.length() - 1 i input.length() - 1 input.length() input.length input 1 i++ i++ i {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			} {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			} if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				} input.charAt(i) != input.charAt(i + 1) input.charAt(i) input.charAt input i input.charAt(i + 1) input.charAt input i + 1 i 1 {
					result = true;
					break;
				} result = true result true break; if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			} result {
				out.println("Yes");
			} out.println("Yes") out.println out "Yes" {
				out.println("No");
			} out.println("No") out.println out "No" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	}

	static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	}
} public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	}

	static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	}
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		A solver = new A();
		solver.solve(1, in, out);
		out.close();
	}

	static class A {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String input = in.next();
			boolean result = false;
			for (int i = 0; i < input.length() - 1; i++) {
				if (input.charAt(i) != input.charAt(i + 1)) {
					result = true;
					break;
				}
			}

			if (result) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

	}
}

