function main() {
????????S = input[0];
????????h = parseInt(S / 3600);
????????m = parseInt(S / 60 % 60);
????????s = parseInt(S % 60);
??
????????msg = h + ':' + m + ':' + s;
??
????????console.log(msg);
}
??
var input = "";
??
process.stdin.resume();
process.stdin.setEncoding("utf-8");
process.stdin.on("data", function(chunk) {
????????input += chunk;
});
??
process.stdin.on("end", function() {
????????input = input.split("\n");
????????main();
})