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Ah, thank you! I could resolve my problems with your hint. At some point I tried to write a character from the string at a position which is out of boundary. This yields the NUL-character. The corrected test for that, substitute < with <=, resolved the problem. Thus my code is now accepted.

Dear all,

I got a Wrong Answer on that problem, also I do not see what exactly is wrong. For simplicity I post here the code where each output line is the same length, i.e., there might be too many spaces in the end. What bothers me more is the following: the output on the command line is different ...