Problem Statement

A pangram is a sentence where every letter of the English alphabet appears at least once.

Given a string sentence containing English letters (lower or upper-case), return true if sentence is a pangram, or false otherwise.

Note: The given sentence might contain other characters like digits or spaces, your solution should handle these too.

Example 1:

Input: sentence = "TheQuickBrownFoxJumpsOverTheLazyDog"
Output: true
Explanation: The sentence contains at least one occurrence of every letter of the English alphabet either in lower or upper case.

Example 2:

Input: sentence = "This is not a pangram"
Output: false
Explanation: The sentence doesn't contain at least one occurrence of every letter of the English alphabet.

Constraints:

• 1 <= sentence.length <= 1000
• sentence consists of lowercase English letters.

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