use Tk;
use Tk::NoteBook;
use strict;
use warnings;
use strict;
use warnings;

while (my $data = <DATA>) {
chomp $data; 
print $data;
if ($data eq "2"){print "->got 2\n"}
}

print "Enter a 2\n";
my $input = <>;
chomp $input;
if ($input eq "2"){print "->got 2\n"}

__DATA__
1
2
3
4