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    \$\begingroup\$ I think you need to specify a standard QWERTY layout if you want this to be a fair challenge. I suggest using this one. \$\endgroup\$ Commented Mar 3, 2014 at 12:09
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    \$\begingroup\$ @JanDvorak We are waiting for your solution ;) \$\endgroup\$ Commented Mar 3, 2014 at 12:29
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    \$\begingroup\$ I don't fully understand. If string manipulation is prohibited, does it mean that stdin is out of the question? So I have to implement some low-level keyboard IO that reads keypresses? This also disqualifies brainfuck, which only reads strings from the stdin. What about stdout, can I send strings to the stdout or do I need to code a keyboard driver of sorts which simulates pressing a different key? \$\endgroup\$ Commented Mar 3, 2014 at 13:03
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    \$\begingroup\$ @fejesjoco are you referring to the last sentence? I read that as "STDIN must be read from and STDOUT written to without buffering" \$\endgroup\$ Commented Mar 3, 2014 at 13:41
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    \$\begingroup\$ As an aside, your questions seem to always generate a large discussion in the comment thread. Maybe it is a sign you should be using the sandbox more? \$\endgroup\$ Commented Mar 3, 2014 at 14:51