Problem: Panic is rising in the committee for doggo standardization — the puppies of the new brood have been born multi-colored! In total there are 26 possible colors of puppies in the nature and they are denoted by letters from 'a' to 'z' inclusive.

The committee rules strictly prohibit even the smallest diversity between doggos and hence all the puppies should be of the same color. Thus Slava, the committee employee, has been assigned the task to recolor some puppies into other colors in order to eliminate the difference and make all the puppies have one common color.

Unfortunately, due to bureaucratic reasons and restricted budget, there's only one operation Slava can perform: he can choose a color x such that there are currently at least two puppies of color x and recolor all puppies of the color x into some arbitrary color y. Luckily, this operation can be applied multiple times (including zero).

For example, if the number of puppies is 7 and their colors are represented as the string "abababc", then in one operation Slava can get the results "zbzbzbc", "bbbbbbc", "aaaaaac", "acacacc" and others. However, if the current color sequence is "abababc", then he can't choose x='c' right now, because currently only one puppy has the color 'c'.

Help Slava and the committee determine whether it is possible to standardize all the puppies, i.e. after Slava's operations all the puppies should have the same color.

Input

The first line contains a single integer n (1 ≤ n ≤ 10^5) — the number of puppies.

The second line contains a string s of length n consisting of lowercase Latin letters, where the i-th symbol denotes the i-th puppy's color.

Output

If it's possible to recolor all puppies into one color, print "Yes".

Otherwise print "No".

Output the answer without quotation signs.

Examples

Input

6
aabddc


Output

Yes


Input

3
abc


Output

No


Input

3
jjj


Output

Yes

Note

In the first example Slava can perform the following steps: 

  1. take all puppies of color 'a' (a total of two) and recolor them into 'b'; 
  2. take all puppies of color 'd' (a total of two) and recolor them into 'c'; 
  3. take all puppies of color 'b' (three puppies for now) and recolor them into 'c'. 



In the second example it's impossible to recolor any of the puppies.

In the third example all the puppies' colors are the same; thus there's no need to recolor anything.

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.*;

public class A {
	static InputReader scn = new InputReader(System.in);
	static OutputWriter out = new OutputWriter(System.out);

	public static void main(String[] args) {
		int n = scn.nextInt();
		String[] s = scn.next().split("");
		HashMap<String, Integer> map = CountFrequencies(s);
		boolean check = false;
		for (String val : map.keySet()) {
			int a = map.get(val);
			if (a > 1)
				check = true;
		}
		if (check || n == 1) {
			out.println("Yes");
		} else {
			out.println("No");
		}
		out.close();
	}

	public static boolean check(int n) {
		int cnt = 0;
		for (int i = 2; i * i <= n; i++) {
			if (n % i == 0) {
				cnt++;
				while (n % i == 0)
					n /= i;
			}
		}
		if (n > 1)
			cnt++;
		return cnt == 2;
	}

	public static boolean CheckForSequence(ArrayList<Integer> arr, int n, int k) {

		for (int i = n - 1; i >= 0; i--) {
			if (k >= arr.get(i))
				k -= arr.get(i);
		}
		if (k != 0)
			return false;
		else
			return true;
	}

	public static int gcd(int a, int b) {
		if (a == 0)
			return b;
		return gcd(b % a, a);
	}

	public static int lcm(int a, int b) {
		return (a * b) / gcd(a, b);
	}

	public static int val11(int n) {
		int val = -1;
		for (int i = n; i <= Math.sqrt(n); i++) {
			if (n % i == 0) {
				val = n / i;
				break;
			}
		}
		return val;
	}

	public static HashMap<String, Integer> CountFrequencies(String[] arr) {
		HashMap<String, Integer> map = new HashMap<>();
		for (int i = 0; i < arr.length; i++) {
			String a = arr[i];
			if (map.containsKey(a)) {
				map.put(a, map.get(a) + 1);
			} else {
				map.put(a, 1);
			}
		}
		return map;
	}

	public static int[] readArray(int n) {
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = scn.nextInt();
		}
		return a;
	}

	public static int countPrimeFactors(int n) {
		int count = 0;
		while (n % 2 == 0) {
			n = n / 2;
			count++;
		}
		for (int i = 3; i <= Math.sqrt(n); i = i + 2) {
			while (n % i == 0) {
				n = n / i;
				count++;
			}
		}
		if (n > 2)
			count++;
		return (count);
	}

	public static ArrayList<Integer> printKAlmostPrimes(int n) {
		ArrayList<Integer> list = new ArrayList<>();
		for (int i = 1, num = 2; i <= n; num++) {
			if (countPrimeFactors(num) == 2) {
				if (num > n) {
					break;
				}
				list.add(num);
				i++;
			}
		}
		return list;
	}

	public static int[] SieveOfEratosthenes(int[] arr) {
		int n = arr.length;
		for (int i = 3; i < n; i = i + 2) {
			arr[i] = 1;
		}
		for (int i = 3; i < n; i = i + 2) {
			if (arr[i] == 1) {
				for (int j = i * i; j < n; j = j + i) {
					arr[j] = 0;
				}
			}
		}
		arr[2] = 1;
		arr[0] = arr[1] = 0;
		return arr;
	}

	static void sort(int[] a) {
		ArrayList<Integer> l = new ArrayList<>();
		for (int i : a) {
			l.add(i);
		}
		Collections.sort(l);
		for (int i = 0; i < a.length; i++) {
			a[i] = l.get(i);
		}
	}

	public static ArrayList<String> printPermutn(String str, String ans, ArrayList<String> list) {
		if (str.length() == 0) {
			list.add(ans);
		}
		for (int i = 0; i < str.length(); i++) {
			char ch = str.charAt(i);
			String ros = str.substring(0, i) + str.substring(i + 1);
			printPermutn(ros, ans + ch, list);
		}
		return list;
	}

	public static ArrayList<String> GetSubSequences(String s) {
		if (s.length() == 0) {
			ArrayList<String> br = new ArrayList<>();
			br.add("");
			return br;
		}
		char ch = s.charAt(0);
		String ms = s.substring(1);

		ArrayList<String> rr = GetSubSequences(ms);

		ArrayList<String> mr = new ArrayList<>();

		int t = rr.size();
		for (int i = 0; i < t; i++) {
			mr.add(rr.get(i));
			mr.add(ch + rr.get(i));

		}

		return mr;

	}

	public static int binarySearch(int arr[], int l, int r, int x) {
		if (r >= l) {
			int mid = l + (r - l) / 2;
			if (arr[mid] == x)
				return mid;
			if (arr[mid] > x)
				return binarySearch(arr, l, mid - 1, x);
			return binarySearch(arr, mid + 1, r, x);
		}
		return -1;
	}

	public static int firstOccurence(int array1[], int low, int high, int x, int n) {
		if (low <= high) {
			int mid = low + (high - low) / 2;
			if ((mid == 0 || x > array1[mid - 1]) && array1[mid] == x)
				return mid;
			else if (x > array1[mid])
				return firstOccurence(array1, (mid + 1), high, x, n);
			else
				return firstOccurence(array1, low, (mid - 1), x, n);
		}
		return -1;
	}

	public static int lastOccurence(int array2[], int low, int high, int x, int n) {
		if (low <= high) {
			int mid = low + (high - low) / 2;
			if ((mid == n - 1 || x < array2[mid + 1]) && array2[mid] == x)
				return mid;
			else if (x < array2[mid])
				return lastOccurence(array2, low, (mid - 1), x, n);
			else
				return lastOccurence(array2, (mid + 1), high, x, n);
		}
		return -1;
	}

	public static boolean isPrime(long n) {
		if (n < 2)
			return false;
		if (n == 2 || n == 3)
			return true;
		if (n % 2 == 0 || n % 3 == 0)
			return false;
		long sqrtN = (int) Math.sqrt(n) + 1;
		for (long i = 6L; i <= sqrtN; i += 6) {
			if (n % (i - 1) == 0 || n % (i + 1) == 0)
				return false;
		}
		return true;
	}

	public static void quickSort(int[] arr, int lo, int hi) {
		if (lo >= hi) {
			return;
		}
		int mid = (lo + hi) / 2;
		int pivot = arr[mid];
		int left = lo;
		int right = hi;
		while (left <= right) {
			while (arr[left] < pivot) {
				left++;
			}
			while (arr[right] > pivot) {
				right--;
			}
			if (left <= right) {
				int temp = arr[left];
				arr[left] = arr[right];
				arr[right] = temp;
				left++;
				right--;
			}
		}
		quickSort(arr, lo, right);
		quickSort(arr, left, hi);
	}

	static class InputReader {
		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;
		private SpaceCharFilter filter;

		public InputReader(InputStream stream) {
			this.stream = stream;
		}

		public int read() {
			if (numChars == -1)
				throw new InputMismatchException();
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (numChars <= 0)
					return -1;
			}
			return buf[curChar++];
		}

		public int nextInt() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public long nextLong() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public String nextLine() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public boolean isSpaceChar(int c) {
			if (filter != null)
				return filter.isSpaceChar(c);
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		public String next() {
			return nextLine();
		}

		public interface SpaceCharFilter {
			public boolean isSpaceChar(int ch);
		}
	}

	static class OutputWriter {
		private final PrintWriter writer;

		public OutputWriter(OutputStream outputStream) {
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}

		public OutputWriter(Writer writer) {
			this.writer = new PrintWriter(writer);
		}

		public void print(Object... objects) {
			for (int i = 0; i < objects.length; i++) {
				if (i != 0) {
					writer.print(' ');
//                    writer.print(1);
				}
				writer.print(objects[i]);
			}
		}

		public void println(Object... objects) {
			print(objects);
			writer.println();
		}

		public void close() {
			writer.close();
		}
	}

}