/*
 * input is:
 *
 * firstName middleName lastName
 *
 * output is:
 *
 * lastName, firstInitial.middleInitial.
 *
 * Ex:
 *
 * input:
 * Pat Silly Doe
 *
 * output:
 *
 * Doe, P.S.
 */

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

int main() {

   /* Type your code here. */

	string f, m, l, s;
	//getline(cin, s);

	cin >> f;
	cin >> m;
	cin >> l;


	if(l.size() != 0){
		cout << l << ", " << f.at(0) << "." << m.at(0) << ".\n";
	}
	else{
		cout << m << ", " << f.at(0) << ".\n";
	}




/*
	if(true){
		cout << l << ", " << f.at(0) << "." << l.at(0) << ".\n";
	}
	else{
		cout << l << ", " << f.at(0) << ".\n";
	}

*/

   return 0;
}