function solve(hourS, minS, hourA, minA) {

hourS=+hourS;
hourA=+hourA;
minS=+minS;
minA=+minA;

let rmS= hourS*60+minS;
let rmA= hourA*60+minA;
let late=rmA-rmS;
let early= rmS-rmA;
let hhA=Math.floor((rmA-rmS)/60);
let mindiflate=minA-minS;

if (rmS<rmA) {
    console.log ("Late");
    if (rmS+60>rmA) {
        console.log(`${late} minutes after the start`);
    } else {
      if (minA>=minS) {
        console.log (`${hhA}:${mindiflate} hours after the start`)
    } else {
        mindiflate+=60;
        console.log (`${hhA}:${mindiflate} hours after the start`);
    }
}}
else if ((rmA+30>=rmS) && (rmS>=rmA)) {
    console.log ("On time");
    if (rmA!==rmS) {
        console.log (`${early} minutes before the start`);
    }
}
else if ((rmA+30<rmS) && (rmS>=rmA)) {
    console.log ("Early");
    if ((early<60) && (early>=10)) {
        console.log (`${early} minutes before the start`);
    } else if (early>=60) {
        let h=Math.floor(early/60);
        let m=early%60;

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

    }
}
}