from cisc$108$ import assert$\_$equal

def convert$\_$operator$($ch$)$:

if $ch=={?}^{\text{'}}+\text{'}$:

return $1$

elif $ch==\text{'}-\text{'}$:

return $-1$

else:

return $0$

$f=$ open $(\text{'}$plus and minus.txt$\text{'})$

data $=f*read()$

total $=0$

for $s$ in data:

total $+=$ convert$\_$operator$($s$)$

print$($total$)$

f$.$close$()$

assert$\_$equal$()$