Pangram

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Level EASY

A word or a sentence is called a pangram if all the characters of this language appear in it at least once. You are given a string s consisting of lowercase and uppercase Latin letters. Check whether this string is a pangram. Print "YES" or "NO".

We say that the string contains a letter of the Latin alphabet, if this letter occurs in the string in either uppercase or in lowercase.

Input format :
Line 1 : n (Number of characters in string)
Line 2 : Input string s
Output format :
YES or NO
Constraints :

1 <= n <= 100

Sample Input 1 :
12
toosmallword
Sample Output 1 :
NO
Sample Input 2 :
35
TheQuickBrownFoxJumpsOverTheLazyDog
Sample Output 2 :
YES

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