m=[1]*10
n=int(input())
for _ in range(n):
	*t,=input().split()
	a,b,c,d=map(int,[i for i in t[:4]])
	if t[4]=='NO':
		m[a],m[b],m[c],m[d]=0,0,0,0
	else:
		for j in [a,b,c,d]:
			m[j]=m[j]+1 if m[j]>0 else 0
print(m.index(max(m)))