# Created by sarathkaul on 12/11/19


def check_pangram(
 input_str: str = "The quick brown fox jumps over the lazy dog",
) -> bool:
 """
 A Pangram String contains all the alphabets at least once.
 >>> check_pangram("The quick brown fox jumps over the lazy dog")
 True
 >>> check_pangram("My name is Unknown")
 False
 >>> check_pangram("The quick brown fox jumps over the la_y dog")
 False
 """
 frequency = set()
 input_str = input_str.replace(
 " ", ""
 ) # Replacing all the Whitespaces in our sentence
 for alpha in input_str:
 if "a" <= alpha.lower() <= "z":
 frequency.add(alpha.lower())

 return True if len(frequency) == 26 else False


if __name__ == "main":
 check_str = "INPUT STRING"
 status = check_pangram(check_str)
 print(f"{check_str} is {'not ' if status else ''}a pangram string")