function solve (input){
    let timeFirst = Number(input.shift());
    let timeSecond = Number(input.shift());
    let timeThird = Number(input.shift());

    let totalTime = timeFirst + timeSecond + timeThird;
    let minutes = Math.floor(totalTime / 60);
    let seconds = totalTime % 60;

    if (seconds < 10){
        console.log(`${minutes}:0${seconds}`);

    }else {
        console.log(`${minutes}:${seconds}`)
    }
}
solve([ "35",
        "45",
        "44",
    ])