COMPILER WA?

why is it showing wrong answer?
it is passing most of my custom test cases.
Link- CodeChef: Practical coding for everyone

It fails for the following test input:

1
<><
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try this case:
1
<><

Output should be 2 but your code gives 0

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ok, Thanks, solved it!

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what should the output be for case
1
<<>

0 - none of the prefixes:

<
<<
<<>

are valid.

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