n = gets.to_i
cnt = Array.new(10, n)

n.times do |i|
    arr = gets.split
    a, b, c, d, s = arr
    a = a.to_i; b = b.to_i; c = c.to_i; d = d.to_i;
    if s == "NO"
        cnt[a] = 0
        cnt[b] = 0
        cnt[c] = 0
        cnt[d] = 0
    else
        cnt[a] += 1 if cnt[a] != 0
        cnt[b] += 1 if cnt[b] != 0
        cnt[c] += 1 if cnt[c] != 0
        cnt[d] += 1 if cnt[d] != 0
    end
end
puts cnt.index(cnt.max)