if (gotkey == '=') {
                        sendChar(gotkey);
                        break;
                }

                if (gotkey == '+') {
                        flag = 1;
                        temp = 0;
                        sendChar(gotkey);
                        gotkey = 0;
                }

                if (gotkey != 0 && gotkey != '=') {
                        if (flag == 0)
                                l[temp++] = gotkey;
                        else if (flag == 1)
                                r[temp++] = gotkey;
                        sendChar(gotkey);
                        gotkey = 0;
                }