/*

     思维题：注意题目一句话：At some moment it happened so that they shot one and the same can.

             如果两个人都有射中的话，肯定一个can同时被打中

 */

 #include <bits/stdc++.h>

 using namespace std;

 int main(void)      //URAL 1409 Two Gangsters

 {

     int a, b;

     while (cin >> a >> b)

     {

         if (a && b) cout << b -  << " " << a -  << endl;

         else    cout << b << " " << a << endl;

     }

     return ;

 }