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Swap two numbers
     

Swap given two numbers and print them. (Try to do it without a temporary variable.)

Input:
First line contains an integer, the number of test cases 'T'. Each test case should contain two positive numbers a and b.


Output:
Print the 2 numbers after swapping.


Constraints: 
1<=T<=30
1<=a<=1000
1<=b<=1000


Example:
Input:
2
20 30
12 32

Output:
30 20
32 12

**For More Examples Use Expected Output**


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Result:
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