n = io.read()
info = {0,0,0,0,0,0,0,0,0,0}
for i= 1, n do
  line = {}
  j = 1
  for c in (string.gmatch(io.read(),"%w+")) do
    line[j] = c
    j = j + 1
  end
  if line[5]=="NO" then
    for k = 1, 4 do
      info[line[k]+1]=-1
    end
  else
    for k = 1, 4 do
      info[line[k]+1]=info[line[k]+1]+1
    end
  end
end
result = 0
max = -1
for i=1,10 do
  if info[i] > max then
    result = i - 1
    max = info[i]
  end
end
print(result)