teradai@joho01-itpass:~$ ./quiz2.sh.txt 1234
1234:
1 + 2 + 3 + 4
( 1 + 2 ) + 3 + 4
1 + ( 2 + 3 ) + 4
1 + 2 + ( 3 + 4 )
( 1 + 2 + 3 ) + 4
1 + ( 2 + 3 + 4 )
( 1 + 2 ) + ( 3 + 4 )
1 * 2 * 3 + 4
( 1 * 2 ) * 3 + 4
1 * ( 2 * 3 ) + 4
( 1 * 2 * 3 ) + 4
1 * ( 2 * 3 + 4 )
teradai@joho01-itpass:~$ ./quiz2.sh.txt 1111
1111:
can't make 10.
teradai@joho01-itpass:~$ ./quiz2.sh.txt 12345
12345:
the number must be four-digits.