Stderr message
Traceback (most recent call last):
File "/sandbox/2/a.py", line 5, in <module>
print(9*(len(number)-1)+int(number[0]-1))
TypeError: unsupported operand type(s) for -: 'str' and 'int'
Checker message
Files user_out and answer differ
System message
Exited with return code 1