what should be the name of the input file?

what should I put the name of the input file in our main program “input.txt”, “Input.txt”, “INPUT.TXT”,
“input” or what else?

Use Standard I/O functions for input/output. No need to read from input files as it would not get accepted.

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@chirayu is correct, @itsak you can find more in FAQ if you need

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