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

int main() {
	string line;
	getline(cin, line);
	istringstream iss(line);
	vector<long long> a;
	long long tmp;
	while (iss >> tmp) {
		a.push_back(tmp);
		iss.ignore(1, ',');
	}
	cout << a.size() << endl;
	for (int i = 0 ; i != a.size() ; i++) {
		cout << a[i] << endl;
	}
	return 0;
}