题解 | #统计字符#

import sys
for line in sys.stdin.readlines():
    ret = {
        'letters': 0,
        'blank': 0,
        'digit': 0,
        'other': 0
    }
    for c in line[:-1]:
        if 'A' <= c.upper() <= 'Z':
            ret['letters'] += 1
        elif c == ' ':
            ret['blank'] += 1
        elif '0' <= c <= '9':
            ret['digit'] += 1
        else:
            ret['other'] += 1
    print(ret['letters'])
    print(ret['blank'])
    print(ret['digit'])
    print(ret['other'])