integer concatenation

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Problem

You are given number M, and M lines after it.
Each line contains positive integers, separated by single space.
It is possible to concat these integers in one bigger integer.
Find biggest difference between concatenated integer and its reversion.

For example:
You are given 3 positive integers:
1 3 22

It is possible to concat them in 6 ways:
1322
1223
3122
3221
2213
2231

Find that 3221 - 1223 is the biggest difference. And print it (1998).

Options

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now post-mortem time, all source codes will be revealed

Sample input:_

1
1 3 22

Sample output:

1998

Sample input:_

6
1 2 3 4
1 9 5 32
3 3 3
99
51
444 44

Sample output:

3087
82962
0
0
36
0

Sample input:_

6
58 7 945 15 3
15 2
1 2 3 4 5 6 7
8649 12321 45
541 514 523 532
12 23 34 45

Sample output:

593900604
-99
6419754
74172962853
387189108306
24017958

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