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.util.*;
	import java.awt.List;
	import java.io.*;
	import java.lang.*;
import java.lang.reflect.Array;
		
	public class code4
		{
	 	public static void main(String[] args)
			{
				InputReader in = new InputReader(System.in);
				PrintWriter pw = new PrintWriter(System.out);
				
				//Code starts..
				

				int n = in.nextInt();
				String s = in.nextLine();
				int[] a = new int[26];
				for(int i=0; i<n; i++)
					a[s.charAt(i)-'a']++;
				
				boolean flag = false;
				for(int i=0; i<26; i++)
					if(a[i]>=2)
						flag = true;
				
				if(flag || n==1)
					pw.println("Yes");
				else
					pw.println("No");
				
				
				
				
				//Code ends....
				
				pw.flush();
				pw.close();
			}
		
			
			static class InputReader 
			{
				 
				private final InputStream stream;
				private final byte[] buf = new byte[8192];
				private int curChar, snumChars;
				private SpaceCharFilter filter;
		 
				public InputReader(InputStream stream) 
				{
					this.stream = stream;
				}
		 
				public int snext() 
				{
					if (snumChars == -1)
						throw new InputMismatchException();
					if (curChar >= snumChars) 
					{
						curChar = 0;
						try 
						{
							snumChars = stream.read(buf);
						} 
						catch (IOException e) 
						{
							throw new InputMismatchException();
						}
						if (snumChars <= 0)
							return -1;
					}
					return buf[curChar++];
				}
		 
				public int nextInt() 
			    {
					int c = snext();
					while (isSpaceChar(c)) 
					{
						c = snext();
					}
					int sgn = 1;
					if (c == '-')
				    {
						sgn = -1;
						c = snext();
					}
					int res = 0;
					do 
					{
						if (c < '0' || c > '9')
							throw new InputMismatchException();
						res *= 10;
						res += c - '0';
						c = snext();
					} while (!isSpaceChar(c));
					return res * sgn;
				}
		 
				public long nextLong()
			    {
					int c = snext();
					while (isSpaceChar(c)) 
					{
						c = snext();
					}
					int sgn = 1;
					if (c == '-') 
					{
						sgn = -1;
						c = snext();
					}
					long res = 0;
					do 
					{
						if (c < '0' || c > '9')
							throw new InputMismatchException();
						res *= 10;
						res += c - '0';
						c = snext();
					} while (!isSpaceChar(c));
					return res * sgn;
				}
		 
				public int[] nextIntArray(int n) 
				{
					int a[] = new int[n];
					for (int i = 0; i < n; i++) 
					{
						a[i] = nextInt();
					}
					return a;
				}
		 
				public String readString()
			    {
					int c = snext();
					while (isSpaceChar(c)) 
					{
						c = snext();
					}
					StringBuilder res = new StringBuilder();
					do 
					{
						res.appendCodePoint(c);
						c = snext();
					} while (!isSpaceChar(c));
					return res.toString();
				}
		 
				public String nextLine() 
				{
					int c = snext();
					while (isSpaceChar(c))
						c = snext();
					StringBuilder res = new StringBuilder();
					do 
					{
						res.appendCodePoint(c);
						c = snext();
					} while (!isEndOfLine(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;
				}
		 
				private boolean isEndOfLine(int c) 
				{
					return c == '\n' || c == '\r' || c == -1;
				}
		 
				public interface SpaceCharFilter
			    {
					public boolean isSpaceChar(int ch);
				}
			}
			public static long c = 0;
			
			public static long mod = 1000000007;
			public static int d;
			public static int p;
			public static int q;
			public static boolean flag;
			public static long INF= Long.MAX_VALUE;
			
			
			public static double slope(pair p1, pair p2)
			{
				double m = INF;
				if((p1.x - p2.x)!=0)
				m =  p1.y - p2.y/(p1.x - p2.x); 
				
				
				return Math.abs(m);
				
			}
			
			public static long gcd(long i, long l) {
				if (i == 0)
					return (long) l;
				return gcd(l % i, i);
			}
	
			
			
			/*public static int findGCD(int arr[], int n)
			{
			    int result = arr[0];
			    for (int i=1; i<n; i++)
			        result = gcd(arr[i], result);
			 
			    return result;
			}
			*/
			
		
	 
		
			
			
			
			
		    public static long lcm(int[] numbers) {
		        long lcm = 1;
		        int divisor = 2;
		        while (true) {
		            int cnt = 0;
		            boolean divisible = false;
		            for (int i = 0; i < numbers.length; i++) {
		                if (numbers[i] == 0) {
		                    return 0;
		                } else if (numbers[i] < 0) {
		                    numbers[i] = numbers[i] * (-1);
		                }
		                if (numbers[i] == 1) {
		                    cnt++;
		                }
		                if (numbers[i] % divisor == 0) {
		                    divisible = true;
		                    numbers[i] = numbers[i] / divisor;
		                }
		            }
		            if (divisible) {
		                lcm = lcm * divisor;
		            } else {
		                divisor++;
		            }
		            if (cnt == numbers.length) {
		                return lcm;
		            }
		        }
		    }
			public static long fact(long n) {
				
				long factorial = 1;
				 for(int i = 1; i <= n; i++)
			        {
			            factorial *= i;
			        }
				 return factorial;
			}
			
			public static void factSieve(int[] a, int n) {
				
				
				for(int i=2; i<=n; i+=2)
					a[i] = 2;
				
				
				for(int i=3; i<=n; i+=2)
				{
					if(a[i]==0)
					{
						a[i] = i;
						
						for(int j=i; j*i<=n; j++)
						{
							a[i*j] = i;	
						}
					}
				}
				
				int k = 1000;
				while(k!=1)
				{
					System.out.print(a[k]+" ");
					k /= a[k];
					
				}
			}
		
			
			
			public static long choose(long total, long choose){
			    if(total < choose)
			        return 0;
			    if(choose == 0 || choose == total)
			        return 1;
			    return (choose(total-1,choose-1)+choose(total-1,choose))%mod;
			}
			
			public static long[] suffle(long[] a,Random gen)
			{
				int n = a.length;
				for(int i=0;i<n;i++)
				{
					int ind = gen.nextInt(n-i)+i;
					long temp = a[ind];
					a[ind] = a[i];
					a[i] = temp;
				}
				return a;
			}
			
			public static long[] sort(long[] a)
			{
				Random gen = new Random();
				int n = a.length;
				for(int i=0;i<n;i++)
				{
					int ind = gen.nextInt(n-i)+i;
					long temp = a[ind];
					a[ind] = a[i];
					a[i] = temp;
				}
				
				Arrays.sort(a);
				return a;
			}
			
			public static int[] sort(int[] a)
			{
				Random gen = new Random();
				int n = a.length;
				for(int i=0;i<n;i++)
				{
					int ind = gen.nextInt(n-i)+i;
					int temp = a[ind];
					a[ind] = a[i];
					a[i] = temp;
				}
				
				Arrays.sort(a);
				return a;
			}
			
			public static int floorSearch(int arr[], int low, int high, int x)
			{
			    if (low > high)
			        return -1;
			 
			    if (x > arr[high])
			        return high;
			    int mid = (low+high)/2;
			 
			 
			    if (mid > 0 && arr[mid-1] < x && x < arr[mid])
			        return mid-1;
			 
			    if (x < arr[mid])
			        return floorSearch(arr, low, mid-1, x);
			 
			    return floorSearch(arr, mid+1, high, x);
			}
			
			
			public static void swap(int a, int b){
				int temp = a;
				a = b;
				b = temp;
			}
			public static ArrayList<Integer> primeFactorization(int n)
			{
				ArrayList<Integer> a =new ArrayList<Integer>();
				for(int i=2;i*i<=n;i++)
				{
					while(n%i==0)
					{
						a.add(i);
						n/=i;
					}
				}
				if(n!=1)
					a.add(n);
				return a;
			}
			
			
			public static void sieve(boolean[] isPrime,int n)
			{
				for(int i=1;i<n;i++)
					isPrime[i] = true;
				
				isPrime[0] = false;
				isPrime[1] = false;
				
				for(int i=2;i*i<n;i++)
				{
					if(isPrime[i] == true)
					{
						for(int j=(2*i);j<n;j+=i)
							isPrime[j] = false;
					}
				}
			}
			
			public static int lowerbound(ArrayList<Integer> list, int c2) {
				int i=Collections.binarySearch(list, c2);
				if(i<0)
					i = -(i+2);
				return i;
				
				
			}
			
			public static int lowerboundArray(long[] psum, long c2) {
				int i=Arrays.binarySearch(psum, c2);
				if(i<0)
					i = -(i+2);
				return i;
				
				
			}
			
			public static int uperboundArray(long[] psum, long c2) {
				int i=Arrays.binarySearch(psum, c2);
				if(i<0)
					i = -(i+1);
				return i;
				
				
			}
			
			
			public static int uperbound(ArrayList<Integer> list, int c2) {
				int i=Collections.binarySearch(list, c2);
				if(i<0)
					i = -(i+1);
				return i;
				
				
			}

			public static void print(int[] a)
			{
				PrintWriter pw = new PrintWriter(System.out);
				for(int i=0; i<a.length; i++)
					pw.print(a[i]+" ");
				
				pw.println();
				pw.flush();
				pw.close();
				
			}
			
			public static void print(long[] a)
			{
				PrintWriter pw = new PrintWriter(System.out);
				for(int i=0; i<a.length; i++)
					pw.print(a[i]+" ");
				
				pw.println();
				pw.flush();
				pw.close();
				
			}
			
			public static int GCD(int a,int b)
			{
				if(b==0)
					return a;
				else
					return GCD(b,a%b);
			}
			
			public static long GCD(long a,long b)
			{
				if(b==0)
					return a;
				else
					return GCD(b,a%b);
			}
			
			public static void extendedEuclid(int A,int B)
			{
				if(B==0)
				{
					d = A;
					p = 1 ;
					q = 0;
				}
				else
				{
					extendedEuclid(B, A%B);
					int temp = p;
					p = q;
					q = temp - (A/B)*q;
				}
			}
			
			public static long LCM(long a,long b)
			{
				return (a*b)/GCD(a,b);
			}
			
			public static int LCM(int a,int b)
			{
				return (a*b)/GCD(a,b);
			}
			
			public static int binaryExponentiation(int x,int n)
			{
			    int result=1;
			    while(n>0)
			    {
			        if(n % 2 ==1)
			            result=result * x;
			        x=x*x;
			        n=n/2;
			    }
			    return result;
			}
			
			
			public static int[] countDer(int n)
		    {
		        int der[] = new int[n + 1];
		     
		        der[0] = 1;
		        der[1] = 0;
		        der[2] = 1;
		     
		        for (int i = 3; i <= n; ++i)
		            der[i] = (i - 1) * (der[i - 1] + der[i - 2]);
		     
		        // Return result for n
		        return der;
		    }
			
			
			 static long binomialCoeff(int n, int k)
			    {
			    long C[][] = new long[n+1][k+1];
			    int i, j;
			     
			        // Calculate  value of Binomial Coefficient in bottom up manner
			    for (i = 0; i <= n; i++)
			    {
			        for (j = 0; j <= Math.min(i, k); j++)
			        {
			            // Base Cases
			            if (j == 0 || j == i)
			                C[i][j] = 1;
			      
			            // Calculate value using previosly stored values
			            else
			                C[i][j] = C[i-1][j-1] + C[i-1][j];
			          }
			     }
			      
			    return C[n][k];
			    }
			
			public static long binaryExponentiation(long x,long n)
			{
			    long result=1;
			    while(n>0)
			    {
			        if(n % 2 ==1)
			            result= (result * x)%mod;
			        x=(x%mod * x%mod)%mod;
			        n=n/2;
			    }
			    return result%mod;
			}
			
			public static int modularExponentiation(int x,int n,int M)
			{
			    int result=1;
			    while(n>0)
			    {
			        if(n % 2 ==1)
			            result=(result * x)%M;
			        x=(x%M*x%M)%M;
			        n=n/2;
			    }
			    return result;
			}
			
			public static long modularExponentiation(long x,long n,long M)
			{
			    long result=1;
			    while(n>0)
			    {
			        if(n % 2 ==1)
			            result=(result %M* x%M)%M;
			        x=(x*x)%M;
			        n=n/2;
			    }
			    return result;
			}
			
			public static int modInverse(int A,int M)
			{
			    return modularExponentiation(A,M-2,M);
			}
			
			public static long modInverse(long A,long M)
			{
			    return modularExponentiation(A,M-2,M);
			}
			
			
			public static boolean checkYear(int year)
		    {
				if (year % 400 == 0)
		            return true;
		     
		        if (year % 100 == 0)
		            return false;
		     
		        if (year % 4 == 0)
		            return true;
		        return false;
		    }
			
			public static boolean isPrime(int n)
			{
			    
			    if (n <= 1)  return false;
			    if (n <= 3)  return true;
			    
			    if (n%2 == 0 || n%3 == 0) 
			    	return false;
			 
			    for (int i=5; i*i<=n; i=i+6)
			    {
			        if (n%i == 0 || n%(i+2) == 0)
			           return false;
			    }
			    
			    return true;
			}
			
			static class pair implements Comparable<pair>
	 
			{
				Long x;
				Integer y;
				pair(long a,int y)
				{
					this.x=a;
					this.y=y;
				}
				
				public int compareTo(pair o) {
					int result = x.compareTo(o.x);
					if(result==0)
						result = y.compareTo(o.y);
					
					return result;
				}  
				
				public String toString()
				{
					return x+" "+y;
				}
				
				public boolean equals(Object o)
				{
					if (o instanceof pair)
				    {
						pair p = (pair)o;
						return p.x == x && p.y == y ;
					}
					return false;
				}
				
				public int hashCode()
				{
					return new Long(x).hashCode()*31 + new Long(y).hashCode();
				}
			}
		
			
			static class triplet implements Comparable<triplet>
			{
				Integer x,y,z;
				triplet(int x,int y,int z)
				{
					this.x = x;
					this.y = y;
					this.z = z;
				}
				
				public  int compareTo(triplet o)
				{
					int result = x.compareTo(o.x);
					if(result==0)
						result =  y.compareTo(o.y);
					if(result==0)
						result = z.compareTo(o.z);
	 
					return result;
				}
				
				public boolean equlas(Object o)
				{
					if(o instanceof triplet)
					{
						triplet p = (triplet)o;
						return x==p.x && y==p.y && z==p.z;
					}
					return false;
				}
				
				public String toString()
				{
					return x+" "+y+" "+z;
				}
				public int hashCode()
				{
					return new Long(x).hashCode()*31 + new Long(y).hashCode() + new Long(z).hashCode(); 
				}
			}
			
	 
			
			
	
		}