def pangrams(s):
    freq = [0] * 26
    s = s.lower()
    
    for char in s:
        if char.isalpha():
            freq[ord(char) - ord("a")] += 1
            
    for i in range(len(freq)):
        if freq[i] == 0:
            return "not pangram"
            
    return "pangram"