from collections import OrderedDict

def main():
    ord_dict = OrderedDict()

    filename = '285.txt'
    all_chars = 0

    with open(filename, encoding='utf8', errors='ignore') as f:
        while True:
            c = f.read(1).lower()

            if c != ' ':
                counter = ord_dict.get(c, None)
                if counter is None:
                    ord_dict[c] = 1
                else:
                    ord_dict[c] += 1
                all_chars += 1
            if not c:
                break

    tuples_sorted = sorted(ord_dict.items(), key=lambda x:x[1], reverse=True)
    for x, y in tuples_sorted:
        print(x, round(y / all_chars * 100, 2), "%")

if __name__ == '__main__':
    main()