S = input()
ptr = 0
while ptr + 3 <= len( S ):
  ng = False
  for i in range( ptr + 1, ptr + 3, 1 ):
    ng |= S[ ptr ] != S[ i ]
  if not ng:
    if S[ ptr ] == 'O':
      exit( print( "East" ) )
    else:
      exit( print( "West" ) )
  ptr += 1
print( "NA" )