#include <iostream>
#include <string>
using namespace std;

int main() {
    string ans;
    int i;
    long n;
    cin >> n;
    for (i = 0; n > 0; i++) {
        if (i != 0 && i % 3 == 0) {ans = "," + ans;}
        ans = to_string(n % 10) + ans;
        n /= 10;
    }
    cout << ans << endl;
   return 0;
}