https://www.acmicpc.net/problem/1475
위의 방법을 사용하여 문제를 해결 하였다
answer = [0,0,0,0,0,0,0,0,0,0] for x in input(): answer[int(x)] +=1 res = answer[6]+answer[9] answer[6] = res//2 answer[9] = res-answer[6] print(max(answer))