function exam(examHour, examMin, arriveHour, arriveMin) {

    examHour = Number(examHour);
    examMin = Number(examMin);
    arriveHour = Number(arriveHour);
    arriveMin = Number(arriveMin);

    let examTime =(examHour * 60) + examMin;
    let arrivalTime =(arriveHour * 60) + arriveMin;

    let timeDifference = examTime - arrivalTime;

    let earlyHour;
    let earlyMin;
    let lateHour;
    let lateMin;


    if (timeDifference >= 0 && timeDifference <= 30) {  // on time

        if (timeDifference == 0){
            console.log("On time");

        } else {
            console.log("On time");
            console.log(`${timeDifference} minutes before the start`);
        }

    }

    else if (timeDifference > 30 ) {          // Early

        earlyHour = Math.floor(timeDifference / 60);
        earlyMin = timeDifference % 60;


        if (timeDifference > 30 && timeDifference <= 59) {
            console.log("Early");
            console.log(`${timeDifference} minutes before the start`);
        }
        else if (timeDifference == 60){

            console.log("Early");
            console.log(`${earlyHour}:0${earlyMin} hours before the start`);
        }
        else {

            console.log("Early");
            console.log(`${earlyHour}:${earlyMin} hours before the start`);
        }

    }

    else {      //  Late

        timeDifference = Math.abs(timeDifference);
        lateHour = Math.floor(timeDifference / 60);
        lateMin = timeDifference % 60;

        if (timeDifference <= 59) {
            console.log("Late");
            console.log(`${timeDifference} minutes after the start`);

        }
        else if (timeDifference == 60){

            console.log("Late");
            console.log(`${lateHour}:0${lateMin} hours after the start`);
        }
        else {
            console.log("Late");
            console.log(`${lateHour}:${lateMin} hours after the start`);

        }



    }



}