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:
// Codeforces 520A
import java.util.Scanner;

public class CF520A {
    static final Scanner SC = new Scanner(System.in);
    public static void main(String[] args) {
        int charsInString = SC.nextInt();
        String sentence = SC.next();
        boolean isPangram = checkPangram(sentence);
        out(isPangram);
    }

    // Checks and returns boolean whether or not the given string is a pangram
    static boolean checkPangram(String sentence) {
        boolean[] lettersFound = new boolean[26];
        // Assigning letters found
        for (int i = 0; i < sentence.length(); ++i) {
            char ch = sentence.charAt(i);
            if (Character.isLowerCase(ch))
                lettersFound[ch-97] = true;
            else
                lettersFound[ch-65] = true;
        }
        
        // Checking if any letter isn't found yet
        for (int i = 0; i < 26; ++i)
            if (!lettersFound[i])
                return false; // Some letter not found
        return true; // All letters found
    }

    // Prints output corresponding to condition
    static void out(boolean condition) {
        if (condition)
            System.out.println("YES");
        else
            System.out.println("NO");
    }
}