题解 | #游游的数字圈#

import sys

for line in sys.stdin:
    # 移除字符串末尾的换行符
    a = line.strip()
    # 圆圈计数器初始化
    circle_count = 0

    # 遍历
    for char in a:
        if char == '0' or char == '6' or char == '9':
            circle_count += 1
        elif char == '8':
            circle_count += 2
    # 输出圆圈总和
    print(circle_count)