题解 | #字符个数统计#

while  True:
    try:
        #法一
        # s = input()
        # c = ''
        # for i in s :
        #     if 0 <= ord(i) <= 127 and ord(i) != 10 and i not in c:
        #         c += i 
        #     else:
        #         continue 
        # print(len(c))
    
        #法二
        s = input()
        d = set(s)  #set()获取无序不重复集合
        ct = 0
        for i in d :
            if 0 <= ord(i) <= 127 and ord(i) != 10:
                ct += 1
        print(ct)
        
    except:
        break