import std.stdio, std.string, std.conv, std.algorithm;
import std.range, std.array, std.math, std.typecons;

int n;

void main() {
    bool[] flag = new bool[](10);
    flag[] = true;

    scan(n);

    int a, b, c, d;
    string r;

    foreach (i ; 0 .. n) {
        scan(a, b, c, d, r);

        if (r == "YES") {
            foreach (j ; 0 .. 10) {
                if (j == a || j == b || j == c || j == d) continue;
                flag[j] = false;
            }
        }
        else {
            flag[a] = 0;
            flag[b] = 0;
            flag[c] = 0;
            flag[d] = 0;
        }
    }

    assert(flag.sum == 1);

    debug {
        writefln("%(%b %)", flag);
    }

    flag.countUntil(1).writeln;
}


void scan(T...)(ref T args) {
    auto line = readln.split;
    foreach (ref arg ; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}