module main;

import std;

void main()
{
	int N = readln.chomp.to!int;
	BitArray bit = true.repeat(10).array;
	foreach (_; 0 .. N) {
		int A, B, C, D;
		string R;
		readln.chomp.formattedRead("%d %d %d %d %s", A, B, C, D, R);
		if (R == "YES") {
			BitArray b = false.repeat(10).array;
			b[A] = b[B] = b[C] = b[D] = true;
			bit &= b;
		}
		else {
			bit[A] = bit[B] = bit[C] = bit[D] = false;
		}
	}
	writeln(bit.bitsSet.front);
}