题解 | #统计字符#

while True:
    try:
        data = input()
        a1, a2, a3, a4 = 0, 0, 0, 0
        for i in data:
            if i.isalpha():
                a1 += 1
            elif i == ' ':
                a2 += 1
            elif i.isdigit():
                a3 += 1
            else:
                a4 += 1
        for i in [a1, a2, a3, a4]:
            print(i)
    except:
        break