PROGRAMMING:Simple maximum value of sfy
SF senior encountered a problem when writing the title. He saw a series of numbers and wanted to find the largest even number. It took a lot of time to find the largest even number, not to mention the largest even number. Smart acmer, come and help the senior. Find the largest even number of N integers.
###Input format:
The first line of input data is a positive integer T, which represents the number of test data groups. Then there are t groups of test data
Each group of test data occupies 2 lines, the first line is n, the second line is n positive integers (in the range of int type).
There are multiple test data, processing to the end of input.
###Output format:
Each line has an even number, and the output content is the largest even number in n. If there is no even number, output 0.
###Input example:
```in
two
eight
1 2 3 4 5 6 7 8
six
9 8 6 45 11 22
```
###Output example:
The corresponding output is given here. For example:
```out
eight
twenty-two
```
answer：If there is no answer, please comment
###Input format:
The first line of input data is a positive integer T, which represents the number of test data groups. Then there are t groups of test data
Each group of test data occupies 2 lines, the first line is n, the second line is n positive integers (in the range of int type).
There are multiple test data, processing to the end of input.
###Output format:
Each line has an even number, and the output content is the largest even number in n. If there is no even number, output 0.
###Input example:
```in
two
eight
1 2 3 4 5 6 7 8
six
9 8 6 45 11 22
```
###Output example:
The corresponding output is given here. For example:
```out
eight
twenty-two
```
answer：If there is no answer, please comment