#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using ill = int64_t;
using ull = uint64_t;
using namespace std;

void solve() {
  string s;
  cin >> s;
  vector<char> ans;

  for (int i = (int)s.size() - 1, comma = 1; i >= 0; i--, comma++) {
    debug(i, s.at(i), comma);

    ans.push_back(s.at(i));
    if (comma == 3 && i != 0) {
      ans.push_back(',');
      comma = 0;
    }
  }

  for (int i = (int)ans.size() - 1; i >= 0; --i) cout << ans.at(i);
  cout << '\n';
}

void wrapper() {
  rep(i, 3) {
    cout << "[TEST " << i << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}