def check_pali(our_string):
    our_string = our_string.lower()
    counts = defaultdict(int)
    for letter in our_string:
        if ord(letter) >= 97 and ord(letter) <= 122:
            counts[letter] += 1
    # print(counts)
    middle = ""
    for letter in counts:
        if middle and counts[letter] % 2 == 1:
            return False
        elif counts[letter] % 2 == 1:
            middle = letter
    return True