题解 | #字符个数统计#

去重：用集合set()函数，也可以不去重采用哈希表法

字符转ascii码：用ord()函数

while True:
    try:
        # 输入字符串
        string = input()
        # 去重
        ss = set(string)
        num = 0
        for i in ss:
            # 字符转ASCii码
            asc = ord(i)
            if 0 <= asc and asc <= 127 :
                num += 1
        print(num)
    except:
        break