const reader = require("readline").createInterface({
  input: process.stdin,
  output: process.stdout
});
let lines = [];
reader.on("line", line => {
  lines.push(line);
});
reader.on("close", () => {
  const str = lines[0]
  const newArr = str.split(/(.{3})/).filter(function (e) {
    return e
  })
  const newStr = newArr.toString()
  console.log(newStr)
});