题解 | 字符个数统计

s = input()

def sym_check(s):
    # Keep only the unique elements:
    s_uni = ""
    for char in s:
        if char not in s_uni:
            s_uni += char

    # check digit:
    dig_count = 0
    up_count = 0
    lw_count = 0
    sym_count = 0
    spe_list = r'()!"#$@%&~{\'[]^_`|}*+,-./'
    
    for char in s_uni:
        if char.isdigit():
            dig_count += 1
        elif char.isupper():
            up_count += 1
        elif char.islower():
            lw_count += 1
        elif char in spe_list:
            sym_count += 1
        
    total = dig_count + up_count + lw_count + sym_count
    return total

print(sym_check(s))