function exam(examHoursIn, examMinsIn, arrHoursIn, arrMinsIn){
    let examHours = Number(examHoursIn);
    let examMins = Number(examMinsIn);
    let arrHours = Number(arrHoursIn);
    let arrMins = Number(arrMinsIn);

    let examTime = examHours * 60 + examMins; // prevrushtame v minuti 
    let arrTime = arrHours * 60 + arrMins; // prevrushtame v minuti

    let diff = examTime - arrTime; // namirame razlikata za zakusnqvame li ili navreme ili podranqvame

    if (diff < 0) {
        console.log("Late");
        
        if (diff > -60) {
            console.log(`${Math.abs(diff)} minutes after the start`);
        } else {
            let hours = Math.floor(Math.abs(diff / 60));
            let mins = Math.abs(diff % 60);

            if (mins < 10) {
                console.log(`${hours}:0${mins} hours after the start`);    
            } else {
                console.log(`${hours}:${mins} hours before the start`);
            }
        }
    } else if(diff <= 30){
        console.log("On time");

        if (diff > 0){
            console.log(`${diff} minutes before the start`)
        }
    } else {
        console.log("Early");
    }

    if (diff < 60) {
        console.log(`${diff} minutes before the start`)
    } else {
        let hours = Math.floor(diff / 60);
        let mins = diff % 60;

        if (mins < 10) {
            console.log(`${hours}:0${mins} hours before the start`);    
        } else {
            console.log(`${hours}:${mins} hours before the start`);
        }
    }

}

exam("9",
"00",
"10",
"30")