var lines=[];
var reader = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});
reader.on('line', function (line) {
  lines.push(line);
});
reader.on('close', function () {
  var l=lines[0];
  var pad=(3-(l.length%3))%3;
  l=["","0","00"][pad]+l;
  l=l.replace(/\d\d\d/g,"$&,").substr(pad).replace(/,$/,"");
  console.log(l);
});