function solve(hourExam, minutesExam, hourArrive, minutesArrive) {
  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`);
      }
    }
  }
}