integer::N,i,j,ans
  integer,dimension(1:6)::A,B,C,D
  character*3,dimension(1:6)::R
  integer::memo(0:9)
  data memo/10*1/

  read *, N
  do i=1,N
     read *,A(i),B(i),C(i),D(i),R(i)
  end do

  do i=1,N

     if(R(i).eq."YES") then
        do j=0,9
           if(j.eq.A(i) .or. &
              j.eq.B(i) .or. &
              j.eq.C(i) .or. &
              j.eq.D(i) ) then
           else
              memo(j)=0
           end if
        end do
     else
        memo(A(i))=0
        memo(B(i))=0
        memo(C(i))=0
        memo(D(i))=0
     end if
  end do

  do i=0,9
     if(memo(i).eq.1) then
        ans=i
     end if
  end do

  print '(i0)',ans
end program