use std::{
    collections::HashSet,
    io::{self, BufRead},
};

fn main() {
    let input = io::stdin()
        .lock()
        .lines()
        .map(|l| {
            l.unwrap()
                .split(' ')
                .map(std::string::ToString::to_string)
                .collect::<Vec<_>>()
        })
        .collect::<Vec<_>>();

    let mut possible = (0..=9).collect::<HashSet<_>>();

    input[1..].iter().for_each(|l| {
        let numbers = l[..4]
            .iter()
            .map(|n| n.parse::<usize>().unwrap())
            .collect::<HashSet<_>>();

        if l[4] == "YES" {
            possible.retain(|n| numbers.contains(n));
        } else {
            possible.retain(|n| !numbers.contains(n));
        }
    });

    println!("{}", possible.iter().next().unwrap());
}