function solve(arr) {
  let list = {}
  for (let el of arr) {
    if (el === 'Ave Cesar') {
      break
    }
    else if (el.includes(' -> ')) {
      add(el)
    }
    else if (el.includes(' vs ')) {
      battle(el)
    }
  }
  let tier = Object.entries(list)
  let array = []
  for (let elem of tier) {
    let name = elem[0]
    let pow = Object.entries(elem[1])
    let sum = pow.map(a => a[1]).reduce((a, b) => a + b)
    array.push([name, pow, sum])
  }
  array.sort((a, b) => b[2] - a[2] || a[0].localeCompare(b[0]))
  for (let part of array) {
    console.log(`${part[0]}: ${part[2]} skill`);
    part[1]
      .sort((a, b) => b[1] - a[1] || a[0].localeCompare(b[0]))
      .map(x => console.log(`- ${x[0]} <!> ${x[1]}`))
  }

  function add(el) {
    let [gladiator, skill, power] = el.split(' -> ')
    power = Number(power)
    if (!list.hasOwnProperty(gladiator)) {
      list[gladiator] = {}
      list[gladiator][skill] = power
    }
    else {
      if (!list[gladiator].hasOwnProperty(skill)) {
        list[gladiator][skill] = power
      }
      else {
        let oldPow = list[gladiator][skill]
        if (power > oldPow) {
          list[gladiator][skill] = power
        }
      }
    }
  }
  function battle(el) {
    let [gladiatorA, gladiatorB] = el.split(' vs ')
    if (list.hasOwnProperty(gladiatorA) && list.hasOwnProperty(gladiatorB)) {
      let skillA = list[gladiatorA]
      let skillB = list[gladiatorB]
      for (let elA in skillA) {
        for (let elB in skillB) {
          if (elA === elB) {
            if (skillA[elA] > skillB[elB]) {
              delete list[gladiatorB]
            }
            else if (skillA[elA] < skillB[elB]) {
              delete list[gladiatorA]
            }
          }
        }
      }
    }
  }
}