
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 %minute_sec ) / minute_sec;
var sec = (seconds % hour_sec % minute_sec );

console.log(hour + ':'+minute+':'+sec);
});