Hello, nikov, you wrote: N> Write in your favourite language the program (or function) which accepts a line, checks it on exact coincidence to the initial text of the same program and prints (or returns) result of this check (true/false, 1/0, "yes" / "is not present" etc.). If language has the built in command for obtaining of the initial text of the program, do not use it. Mathematicians love any silly tasks to invent which in practice are absolutely useless.
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