# Pangrams 🔤
def pangrams(s):
    alphabet = set('abcdefghijklmnopqrstuvwxyz')
    i = 0
    length = len(s)
    while len(alphabet) > 0 and i < length:
        alphabet.discard(s[i].lower())
        i+=1
    return "pangram" if len(alphabet) == 0 else "not pangram"