
process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function(chunk){
var line = chunk.toString().split('\n');
var seconds = Number(line[0]);
var hour_sec = 60*60;
var minute_sec = 60;

var hour = Math.floor(seconds / hour_sec);
var minute = Math.floor((seconds % hour_sec) / minute_sec);
var sec = seconds % hour_sec % minute_sec;
console.log(hour + ':'+minute+':'+sec);
});