Duplicate characters

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Language is selected by the extension of the file. See the list of supported languages to know the extension of your language.

Problem

Print every input character twice!
-leonid

Options

exec is denied

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

Sample input:_

Hello, world!

Sample output:

HHeelllloo,,  wwoorrlldd!!

Sample input:_

[]<[]>(){}<>{}{}(<>)
{([[((([[{>]])))]])}
{<[[{(())]]]>}{}(())
[<{((<[<[[]]>]>))}>]
<><<(<(<{[()]}>)>)>>
<[]>{}()()<>{(<(({<<
()[<()<[{<>{{>}}]>>]
()[[{(((((<>)))))}]]
<[{}]><[]><>([[{{(<(
([])[[<<{{((])}}>>]]

Sample output:

[[]]<<[[]]>>(()){{}}<<>>{{}}{{}}((<<>>))

{{(([[[[(((((([[[[{{>>]]]]))))))]]]]))}}

{{<<[[[[{{(((())))]]]]]]>>}}{{}}(((())))

[[<<{{((((<<[[<<[[[[]]]]>>]]>>))))}}>>]]

<<>><<<<((<<((<<{{[[(())]]}}>>))>>))>>>>

<<[[]]>>{{}}(())(())<<>>{{((<<(((({{<<<<

(())[[<<(())<<[[{{<<>>{{{{>>}}}}]]>>>>]]

(())[[[[{{((((((((((<<>>))))))))))}}]]]]

<<[[{{}}]]>><<[[]]>><<>>(([[[[{{{{((<<((

(([[]]))[[[[<<<<{{{{((((]]))}}}}>>>>]]]]

Sample input:_

:
:-
:-)
:-)))
:-)))))
:-)))))))
:-)))))))))
:-)))))))))))
:-)))))))))))))

Sample output:

::

::--

::--))

::--))))))

::--))))))))))

::--))))))))))))))

::--))))))))))))))))))

::--))))))))))))))))))))))

::--))))))))))))))))))))))))))

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