#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).unwrap();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().unwrap()
    };
}

use std::collections::HashSet;

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: usize = parse_next!(input);
    let mut a: Vec<usize> = vec![];
    let mut b: Vec<usize> = vec![];
    let mut c: Vec<usize> = vec![];
    let mut d: Vec<usize> = vec![];
    let mut r: Vec<String> = vec![];
    (0..n).for_each(|_| {
        a.push(parse_next!(input));
        b.push(parse_next!(input));
        c.push(parse_next!(input));
        d.push(parse_next!(input));
        r.push(parse_next!(input));
    });

    let mut nums = HashSet::new();
    (0..=9).for_each(|num| {
        nums.insert(num);
    });

    for i in 0..n {
        match r[i].as_str() {
            "YES" => {
                for num in 0..=9 {
                    if num == a[i] {
                        continue;
                    }
                    if num == b[i] {
                        continue;
                    }
                    if num == c[i] {
                        continue;
                    }
                    if num == d[i] {
                        continue;
                    }
                    nums.remove(&num);
                }
            }
            "NO" => {
                nums.remove(&a[i]);
                nums.remove(&b[i]);
                nums.remove(&c[i]);
                nums.remove(&d[i]);
            }
            _ => unreachable!(),
        }
    }

    let ans = nums.iter().nth(0).unwrap().clone();

    println!("{}", ans);
}