思维题 URAL 1409 Two Gangsters

题目传送门

 /*
     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 ;
 }