const data = require('./data')

const filterPlaces = (pass, entity, mark, min, max) => (
  pass.forEach((p, i) => {
    if (i > min && i <= max) {
      p === mark
        ? entity.splice(entity.length / 2, entity.length)
        : entity.splice(0, entity.length / 2)
    }
  })
)

const checkId = (p) => {
  const pass = p.split('')
  const row = [...Array(128).keys()]
  const column = [...Array(8).keys()]

  filterPlaces(pass, row, 'F', -1, 6)
  filterPlaces(pass, column, 'L', 6, 9)

  return ID = row[0] * 8 + column[0]
}

console.log(Math.max(...data.map(checkId)))