#coding: utf-8
##yuki_24

s_yes=[0 for i in xrange(10)]
s_no=[1 for i in xrange(10)]
s_test=[0 for i in xrange(10)]

n=int(raw_input())
for i in xrange(n):
 s=raw_input().split()
 if s[4]=="YES":
  for j in xrange(4):
   s_yes[int(s[j])]+=1
 elif s[4]=="NO":
  for j in xrange(4):
   s_no[int(s[j])]=0
  
for i in xrange(10):
 s_test[i]=s_yes[i]*s_no[i]
 

if max(s_yes)==0:
 print s_no.index(1)
else:
 print s_test.index(max(s_test))