import std.algorithm, std.conv, std.range, std.stdio, std.string;
import core.bitop;

void main()
{
  size_t n = readln.chomp.to!size_t;

  uint c = toBuf(10.iota);

  foreach (_; n.iota) {
    string[] rd = readln.split;
    int[] ai = rd[0..4].to!(int[]);
    string yn = rd[4];

    int b = toBuf(ai);
    c = yn.predSwitch("YES", c & b, "NO", c & ~b);
  }

  writeln(bsr(c));
}

uint toBuf(Range)(Range ai)
  if (isInputRange!Range)
{
  return reduce!((a, b) => a | (1 << b))(0, ai);
}