def count_character(name):
    with open(name, 'r', encoding='utf-8') as data:
        string_get = data.read().strip()
    check_string = "，。？！@#￥%……&*；（:; ） ——+|、·：“”’‘\n"
    for i in check_string:
        if i in string_get:
            string_get = string_get.replace(i, '')
    # print(string_get)
    return len(string_get)


file_name = input()

print(count_character(file_name))