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:
/**
 * Created by windows on 26/Oct/2015.
 */
import java.util.*;
import java.io.*;
import java.math.*;
public class CF {
    FastScanner in;
    PrintWriter out;
    ArrayList<Character> first, second, third;
    void solve(){
        int n = in.nextInt();
        String s = in.next();
        String d = s.toLowerCase();int a[]= new int[1001];Arrays.fill(a, 0);
        char w[]= d.toCharArray();
        first = new ArrayList<>();
        for(char f:w)
        first.add(f);
        for(char e='a'; e<='z'; e++){
            a[e]=Collections.frequency(first, e);
        }
        int k=0;
        for(int r=97; r<=122; r++){
            if(a[r]!=0)
                k++;
        }
        if(k==26)
            System.out.println("YES");
        else
            System.out.println("NO");

        }


    void run(){
        try {
            in = new FastScanner(new File("B.in"));
            out = new PrintWriter(new File("B.out"));

            solve();
            out.close();
        }
        catch(FileNotFoundException e){
            e.printStackTrace();
        }
    }

    void runIO(){
        in = new FastScanner(System.in);
        out = new PrintWriter(System.out);

        solve();
        out.close();
    }
    class FastScanner{
        BufferedReader br;
        StringTokenizer st;
        public FastScanner(File f){
            try{
                br = new BufferedReader(new FileReader(f));
            }
            catch(FileNotFoundException e){
                e.printStackTrace();
            }
        }
        public FastScanner(InputStream f){
            br = new BufferedReader(new InputStreamReader(f));
        }
        String next(){
            while(st==null || !st.hasMoreTokens()){
                String s = null;
                try{
                    s= br.readLine();
                }
                catch(IOException e){
                    e.printStackTrace();
                }
                if(s==null)
                    return null;
                st = new StringTokenizer(s);
            }
            return st.nextToken();
        }

        boolean hasMoreTokens(){
            while(st==null || !st.hasMoreTokens()){
                String s = null;
                try{
                    s= br.readLine();
                }
                catch(IOException e){
                    e.printStackTrace();
                }
                if(s==null)
                    return false;
                st = new StringTokenizer(s);
            }
            return true;
        }
        int nextInt(){
            return Integer.parseInt(next());
        }
        long nextLong(){
            return Long.parseLong(next());
        }
        double nextDouble(){
            return Double.parseDouble(next());
        }
    }

    public static void main(String[] args) {
        new CF().runIO();
    }
}