function solve(hourExam, minExam, hourArrive, minArrive) {
    hourExam = Number(hourExam);
    minExam = Number(minExam);
    hourArrive = Number(hourArrive);
    minArrive = Number(minArrive);

    let hourE = (hourExam * 60) + minExam;
    let hourA = (hourArrive * 60) + minArrive;
    let differrence = (hourE - hourA);

    if (differrence > 30) {

        if(differrence < 60){
            console.log('Early');

            console.log(`${Math.abs(hourA - hourE)} minutes before the start`);

        }else {
            let hh = differrence / 60;
            let mm = differrence % 60;
            if(mm ==0 || mm <=9){
                mm = '0' + differrence % 60;
            }
            console.log('Early');
            console.log(`${Math.floor(hh)}:${mm} hours before the start`);
        }



    } else if (differrence >= 0 && differrence <= 30) {
        console.log('on time');
        console.log(`${Math.abs(hourA - hourE)} minutes before the start`)

    }

    else  {
        if(differrence < 0 && differrence > -60){
            console.log('late');
            console.log(`${Math.abs(hourA - hourE)} minutes after the start`);


        }else{
            let hh = Math.abs(differrence / 60);
            let mm = Math.abs(differrence % 60);
            console.log('late');
            console.log(`${Math.floor(hh)}:${mm} hours after the start`);
        }
        //late