function pipedVal (input){
    let hourExam = Number(input.shift());
    let minutesExam = Number(input.shift());
    let hourArrive = Number(input.shift());
    let minutesArrive = Number(input.shift());
    let examStartInMinutes = (hourExam*60) + (minutesExam);
    let arriveInMinutes = (hourArrive*60) + (minutesArrive);
    let differenceTime;
    let hourPipe;
    let minutePipe;


    if (examStartInMinutes == arriveInMinutes){
        console.log(`On time`);
    }
    else if (examStartInMinutes > arriveInMinutes){
        if ((examStartInMinutes - arriveInMinutes) <= 30){
            console.log(`On time`);
            differenceTime = (examStartInMinutes - arriveInMinutes);
            console.log(`${differenceTime} minutes before the start`);
        }
        else if (((examStartInMinutes - arriveInMinutes) > 30) && ((examStartInMinutes - arriveInMinutes) < 60)){
            console.log(`Early`);
            differenceTime = (examStartInMinutes - arriveInMinutes);
            console.log(`${differenceTime} minutes before the start`);
        }
        else if ((examStartInMinutes - arriveInMinutes) >= 60){
            console.log(`Early`);
            differenceTime = (examStartInMinutes - arriveInMinutes);
            hourPipe = (Math.floor(differenceTime / 60));
            minutePipe = (Math.floor(differenceTime % 60));
            if (minutePipe < 10) {
                console.log(`${hourPipe}:0${minutePipe} hours before the start`)
            }
            else {
                console.log(`${hourPipe}:${minutePipe} hours before the start`)
            }
        }
    }
    else if (arriveInMinutes > examStartInMinutes) {
        console.log(`Late`);
        if ((arriveInMinutes - examStartInMinutes) < 60 ) {
            differenceTime = (arriveInMinutes - examStartInMinutes);
            console.log(`${differenceTime} minutes after the start`);
        }
        else if ((arriveInMinutes - examStartInMinutes) >= 60){
            differenceTime = (arriveInMinutes - examStartInMinutes);
            hourPipe = (Math.floor(differenceTime / 60));
            minutePipe = (Math.floor(differenceTime % 60));
            if (differenceTime < 10) {
                console.log(`${hourPipe}:0${minutePipe} hours after the start`);
            }
            else {
                console.log(`${hourPipe}:${minutePipe} hours after the start`);
            }
        }
    }
}

pipedVal (['11','30','12','29']);