function solve ([wordsWithDefinitions, wordsToCheck, command]) {
  let dictionary = {}

  wordsWithDefinitions
    .split(' | ')
    .map(x => x.split(': '))
    .forEach(([word, definition]) => {
      if (!dictionary.hasOwnProperty(word)) {
        dictionary[word] = []
      }

      dictionary[word].push(definition)
    })

  wordsToCheck.split(' | ').forEach(word => {
    if (dictionary.hasOwnProperty(word)) {
      console.log(word)
      dictionary[word]
        .sort((a, b) => b.length - a.length)
        .forEach(definition => {
          console.log(` -${definition}`)
        })
    }
  })

  if (command === 'List') {
    console.log(
      Object.keys(dictionary)
        .sort((a, b) => a.localeCompare(b))
        .join(' ')
    )
  }
}