Global symbol "$file1" requires explicit package name (did you forget to declare "my $file1"?) at sid.pl line 5.
Can't find string terminator "END1" anywhere before EOF at sid.pl line 5.

##</code><code>##

   open(my $f3, ">", "C:/Users/Siddharth/Desktop/two.txt")
    or die "Can't open < input.txt: $!";