chomp(my $n = <STDIN>);
my %count = map {$_ => 0} (0..9);
for (1..$n){
    chomp(my $in = <STDIN>);
    my @ar = split / /,$in;
    my $yn = pop @ar;
    for (@ar){
        $count{$_}++ if $yn eq 'YES';
        delete $count{$_} if $yn eq 'NO';
    } 
}
my @sorted = sort {$count{$b} <=> $count{$a}} keys %count;
print $sorted[0],"\n";