Pangram Checking
Easy Accuracy: 55.84% Submissions: 9112 Points: 2

Given a string check if it is Pangram or not. A pangram is a sentence containing every letter in the English Alphabet.

Example 1:

Input:
S = Bawds jog, flick quartz, vex nymph
Output: 1
Explantion: In the given input, there
are all the letters of the English
alphabet. Hence, the output is 1.

Example 2:

Input:
S = sdfs
Output: 0
Explantion: In the given input, there
aren't all the letters present in the
English alphabet. Hence, the output
is 0.

Your Task:
 You need to complete the function checkPangram() that takes a string as a parameter and returns true if the string is a pangram, else it returns false.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(Number of distinct characters).

Constraints:
1 <= |S| <= 104

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