Champernowne Verification

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Problem

Reposted from Kattis (the leaderboards can be cheated there)

Verify if a number is the nth Champernowne number, where 1 <= n <= 9. If yes, print which item it is in the sequence, else -1.

Examples:

1234 -> 4
1234567 -> 7
123456789 -> 9
456 -> -1
1279 -> -1

The deadline of this problem was removed as Kattis wants people not to disclose solutions: https://support.kattis.com/support/solutions/articles/79000112016-can-i-publish-my-solutions-online- . Thanks tails for the report!

Options

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rejudge feature is enabled

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Sample input:_

23456
5678
1234567
1234
568899
12345
123456
234
144223
123456789
12345678
2387545
1020304
98765
54890
123456787
123456789
123
1234524
344569
3450
1
123456
109273018
1
9
1237871
9382674
23
212345
12
83473298
123457
1987340
1234567
12
12345678
213901
123
67890
12345
281237
7788990
132345
23982723
1234
124
11
23456
243234

Sample output:

-1
-1
7
4
-1
5
6
-1
-1
9
8
-1
-1
-1
-1
-1
9
3
-1
-1
-1
1
6
-1
1
-1
-1
-1
-1
-1
2
-1
-1
-1
7
2
8
-1
3
-1
5
-1
-1
-1
-1
4
-1
-1
-1
-1

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