Pangram
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Problem statement
A typography sample is complete when it contains every English letter at least once, ignoring case. Given its declared length and text, determine whether the sample covers the entire alphabet. Repeated letters are allowed.
Input format
First line: n. Second line: n English letters.
Output format
Print YES if all 26 letters occur, otherwise NO.
Constraints
1 <= n <= 100.
Sample input
26 abcdefghijklmnopqrstuvwxyz
Sample output
YES
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