function! s:output()
  let this = {'lines': []}

  function! this.append(line) abort
    call add(self.lines, a:line)
  endfunction

  function! this.build() abort
    return join(self.lines, "\n")
  endfunction

  return this
endfunction

function! s:main(input) abort
  let o = s:output()

  let r = 'NA'
  let cww = matchstr(a:input[0], 'O\{3}\|X\{3}')
  if cww == 'OOO'
    let r = 'East'
  elseif cww == 'XXX'
    let r = 'West'
  endif

  call o.append(r)
  return o.build()
endfunction

let s:input = getline(1, '$')
enew
put =s:main(s:input)
2,$print