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 java.util.Scanner ; 
public class Codeforces {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
           Scanner console = new Scanner (System.in) ;
           int n = console.nextInt() ; 
           int counta = 0 ; 
           int countb = 0 ; 
           int countc = 0 ; 
           int countd = 0 ; 
           int counte = 0 ; 
           int countf = 0 ; 
           int countg = 0 ; 
           int counth = 0 ; 
           int counti= 0 ; 
           int countj = 0 ; 
           int countk = 0 ; 
           int countl = 0 ; 
           int countm = 0 ; 
           int countn = 0 ; 
           int counto = 0 ; 
           int countp = 0 ; 
           int countq = 0 ; 
           int countr = 0 ; 
           int counts = 0 ; 
           int countt = 0 ; 
           int countu = 0 ; 
           int countv = 0 ; 
           int countw = 0 ; 
           int countx = 0 ; 
           int county = 0 ; 
           int countz = 0 ;
           String x =console.next() ; 
      for (int i=0 ; i<x.length() ; i++)
      {
          if (x.charAt(i)=='a' || x.charAt(i)=='A')
              counta ++ ; 
          if (x.charAt(i)=='b' || x.charAt(i)=='B')
              countb ++ ; 
          if (x.charAt(i)=='c' || x.charAt(i)=='C')
              countc ++ ; 
          if (x.charAt(i)=='d' || x.charAt(i)=='D')
              countd ++ ; 
          if (x.charAt(i)=='e' || x.charAt(i)=='E')
              counte ++ ; 
          if (x.charAt(i)=='f' || x.charAt(i)=='F')
              countf ++ ; 
          if (x.charAt(i)=='g' || x.charAt(i)=='G')
              countg ++ ; 
          if (x.charAt(i)=='h' || x.charAt(i)=='H')
              counth ++ ; 
          if (x.charAt(i)=='i' || x.charAt(i)=='I')
              counti ++ ; 
          if (x.charAt(i)=='j' || x.charAt(i)=='J')
              countj ++ ; 
          if (x.charAt(i)=='k' || x.charAt(i)=='K')
              countk ++ ; 
          if (x.charAt(i)=='l' || x.charAt(i)=='L')
              countl ++ ; 
          if (x.charAt(i)=='m' || x.charAt(i)=='M')
              countm ++ ; 
          if (x.charAt(i)=='n' || x.charAt(i)=='N')
              countn ++ ; 
          if (x.charAt(i)=='o' || x.charAt(i)=='O')
              counto ++ ; 
          if (x.charAt(i)=='P' || x.charAt(i)=='p')
              countp ++ ; 
          if (x.charAt(i)=='q' || x.charAt(i)=='Q')
              countq ++ ; 
          if (x.charAt(i)=='R' || x.charAt(i)=='r')
              countr ++ ; 
          if (x.charAt(i)=='s' || x.charAt(i)=='S')
              counts ++ ; 
          if (x.charAt(i)=='T' || x.charAt(i)=='t')
              countt ++ ; 
          if (x.charAt(i)=='u' || x.charAt(i)=='U')
              countu ++ ; 
          if (x.charAt(i)=='V' || x.charAt(i)=='v')
              countv ++ ; 
          if (x.charAt(i)=='w' || x.charAt(i)=='W')
              countw ++ ; 
          if (x.charAt(i)=='X' || x.charAt(i)=='x')
              countx ++ ; 
          if (x.charAt(i)=='y' || x.charAt(i)=='Y')
              county ++;
          if (x.charAt(i)=='Z' || x.charAt(i)=='z')
              countz ++ ; 
      }
      if (counta>=1 && countb>=1 && countc>=1 && countd>=1 && counte>=1 && countf>=1 && countg>=1 && counth>=1 && counti>=1 && countj>=1 && countk>=1 && countl>=1 && countm>=1 && countn>=1 && counto>=1 && countp>=1 && countq>=1 && countr>=1 && counts>=1 && countt>=1 && countu>=1 && countv>=1 && countw>=1 && countx>=1 && county>=1 && countz>=1 )
      {
          System.out.println("YES");
      }    
      else 
      {
          System.out.println("NO");
      }
}
}