kanna625@ika-itpass:~/public_html/report01$ ./quiz2.sh 1467
桁数　4
1,4,6,7でテンパズルを組みます。
ok
1 - 4 + 6 + 7
(1 - 4) + 6 + 7
1 - (4 - 6) + 7
1 - 4 + (6 + 7)
(1 - 4 + 6) + 7
1 - (4 - 6 - 7)
((1 - 4) + 6) + 7
(1 - (4 - 6)) + 7
1 - ((4 - 6) - 7)
1 - (4 - (6 + 7))
(1 - 4) + (6 + 7)