Problem: A word or a sentence in some language is called a pangram if all the characters of the alphabet of this language appear in it at least once. Pangrams are often used to demonstrate fonts in printing or test the output devices.

You are given a string consisting of lowercase and uppercase Latin letters. Check whether this string is a pangram. We say that the string contains a letter of the Latin alphabet if this letter occurs in the string in uppercase or lowercase.

Input

The first line contains a single integer n (1 ≤ n ≤ 100) — the number of characters in the string.

The second line contains the string. The string consists only of uppercase and lowercase Latin letters.

Output

Output "YES", if the string is a pangram and "NO" otherwise.

Examples

Input

12
toosmallword


Output

NO


Input

35
TheQuickBrownFoxJumpsOverTheLazyDog


Output

YES

Solution (in JAVA):

Solution:

import static java.lang.Long.parseLong;
import static java.lang.Integer.parseInt;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Map.Entry;
import java.util.PriorityQueue;
import java.util.StringTokenizer;

public class Test {

	
	public static void main(String aa[]) throws Exception
	{
	
		Scan s=new Scan();
		int n=s.scanInt();
		String str=s.scanString();
		str=str.toLowerCase();
		int freq[]=new int[26];
		
		for(int i=0;i<n;i++)
		{
			char temp=str.charAt(i);
			freq[temp-'a']++;
		}
		boolean bl=false;
		for(int i=0;i<26;i++)
		{
			if(freq[i]==0)
			{
				bl=true;
				break;
			}
		}
		if(!bl)
			System.out.println("YES");
		else
			System.out.println("NO");
}
}
class Scan
{
   // BufferedReader br;
    StringTokenizer st;
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    String scanString() throws IOException
    {
        while(st==null||!st.hasMoreTokens())
        {
            st=new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
   long scanLong() throws IOException
    {
        return parseLong(scanString());
    }
   int scanInt() throws IOException
   {
       return parseInt(scanString());
   }
    
    
}