题解 | #字符个数统计#

while  True:
    try:
        s = input()

        c = ''

        for i in s :
            if ord(i) <= 127 and ord(i) >= 0 and ord(i) != 10 and i not in c:
                c += i 
            else:
                continue 

        print(len(c))
    
    except:
        break