function solve (params) {
  let customers = {}

  params.slice(0, params.length - 2).forEach(param => {
    if (param.includes(' = ')) {
      let [name1, name2] = param.split(' = ')
      customers[name1] = customers[name2].slice()
    } else {
      let [name, ...flights] = param.split(' ')
      if (!customers.hasOwnProperty(name)) {
        customers[name] = flights
      } else {
        customers[name].push(...flights)
      }
    }
  })

  Object.entries(customers)
    .sort((a, b) => b[1].length - a[1].length || a[0].localeCompare(b[0]))
    .forEach(([customer, flights]) => {
      console.log(
        `#${customer} ::: ${flights.sort((a, b) => a - b).join(', ')}`
      )
    })
}