# -*- coding:utf-8 -*-

if __name__ == "__main__":
	n = input()
	nums = [0 for i in xrange(10)]
	inf = float("INF")
	for i in xrange(n):
		a,b,c,d,r = raw_input().split()
		a,b,c,d = int(a),int(b),int(c),int(d)
		if r == "NO":
			nums[a] = nums[b] = nums[c] = nums[d] = -inf
		else:
			nums[a]+= 1
			nums[b]+= 1
			nums[c]+= 1
			nums[d]+= 1
	print nums.index(max(nums))