BOJ - 1431 - 시리얼 번호

import sys

def isDigitCheck(number) :
    answer = 0
    for i in number :
        if i >= '0' and i <= '9' :
            answer += int(i)
    return answer

def solution():
    N = int(sys.stdin.readline())
    number = []
    for _ in range(N):
        number.append(sys.stdin.readline().strip())

    number = sorted(number, key=lambda x: (len(x), isDigitCheck(x), x))
    for n in number:
        print(n)
        
solution()

https://www.acmicpc.net/problem/1431