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

string example(string name)
{  // assume name = "First Initial Last"
   // return "Last, First"
   int sp1 = name.find(' ');
   int sp2 = name.rfind(' ');
   return name.substr(sp2+1)+ ", "+ name.substr(0,sp1);
}

main()
{
   string test;
   getline(cin, test);
   cout << example(test);
}