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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