/in/foo.cc: In function 'int main()':
/in/foo.cc:64:57: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  else if((a.size()==1 && !isdigit(a[0])) || b.size()==1 && !isdigit(b[0]))
                                             ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

KeyError('config.ini',)