#!perl
use strict;
use warnings;

while (<DATA>) {
    chomp;
    my @lines = map { [ split '' ] } split ' ';

    my @diags_LR =         extract_diagonals(        @lines);
    my @diags_RL = reverse extract_diagonals(reverse @lines);
#print "@diags_LR\n@diags_RL\n";

    my @nums = map  { $_ + 1 }
               grep { wanted($diags_LR[$_]) or wanted($diags_RL[$_]) }
               0 .. $#diags_LR;
    print "Diags found in lines: @nums\n  data:$_\n" if @nums;

}

sub wanted {
    my ($diag) = @_;
#    return $diag =~ m{ \A ([12]) \1+ \z }msx; # All 1's or all 2's
    return $diag =~ m{ 1111 | 2222 }msx; # Four 1's or 2's anywhere
}

sub extract_diagonals {
    my @lines = @_;

    my $row_count    = scalar   @lines;
    my $column_count = scalar @{$lines[0]};
    die unless $column_count > 1 and $row_count > 1;
    
    my $diag_length = ($row_count < $column_count) ? $row_count
                                                   : $column_count;

    my @diagonals;
    for     my $c ( 0 .. ($column_count - $diag_length) ) {
        for my $r ( 0 .. ($row_count    - $diag_length) ) {
            my @diag_chars = map { $lines[$r+$_][$c+$_] }
                             0 .. ($diag_length-1);

            push @diagonals, join( '', @diag_chars );
        }
    }
    return @diagonals;
}

__DATA__
ABCDEFGH IJKLMNOP QRSTUVWX
ABCDEF GHIJKL MNOPQR STUVWX
ABC DEF GHI JKL MNO PQR STU VWX
ABCD EFGH IJKL MNOP QRST UVWX
ABCDE FGHIJ KLMNO PQRST UVWXY
220021 000200 020222 020222
100000 010000 001000 000100
102000 010200 001020 000102
102000 010200 001020 000201