A pangram is a sentence that contains every letter of the English alphabet at least once (case-insensitive). Given a string, return true if it is a pangram, false otherwise. Return false for null or empty input.
The English alphabet contains exactly 26 letters from A to Z. Your solution should check whether all 26 letters appear in the input string, ignoring case and non-alphabetic characters.
Examples:
Input: str = 'The quick brown fox jumps over the lazy dog'
Output: true
Explanation: This sentence contains all 26 letters of the alphabet
Input: str = 'Hello World'
Output: false
Explanation: This string is missing many letters like a, b, c, etc.
Input: str = null
Output: false
Explanation: Null input returns false
Input: str = ''
Output: false
Explanation: Empty string returns false
Input: str = 'abcdefghijklmnopqrstuvwxyz'
Output: true
Explanation: Contains exactly the 26 letters of the alphabet
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