# use strict;
# use warnings;

my %d;
$d{$_} = 0 foreach 0 .. 9;
<>;
while (<>) {
    chomp;
    my @x = split(/\s/);
    my @ds = @x[0 .. ($#x - 1)];
    my $b = $x[-1];
    if ($b eq 'NO') {
        delete $d{$_} foreach @ds;
    }
    last if scalar(keys(%d)) == 1;
}
print((keys(%d))[0], "\n");