How to use empty "<>" (Diamond Operator) inside While loop

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#!/usr/bin/perl -w
while (<>)
{
    print ;
}

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perl diamond.pl colors.txt seasons.txt

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perl diamond.pl these are words and not the file names

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# perl diamond.pl these are words and not the file names
Can't open these: No such file or directory at diamond.pl line 2.
...
Can't open the: No such file or directory at diamond.pl line 2.
Can't open file: No such file or directory at diamond.pl line 2.
Can't open names: No such file or directory at diamond.pl line 2.

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