function solve([time, partOfDay]) {
    time = Number(time);

    if(time >= 10 && time < 18) {
        switch (partOfDay) {
            case  "Monday":
            case "Tuesday":
            case "Wednesday":
            case "Thursday":
            case "Friday":
            case "Saturday":
            console.log("open");
            break;
            case "Sunday":
            console.log(closed);
            break;
            default:
            console.log("error");
             break;
            }
        } else {
        console.log("closed");
      }
     }