function elements(input) {
  let equipment = input.shift().split(" ")
  for(let i of input) {
    let [command, element] = i.split(" ")
    if(command === "Buy") {
      equipment.push(element)
    } else if(command === "Trash") {
      let filter = equipment.filter((a) => a !== element)
      equipment = filter
      } else if(command === "Repair") {
        let findElement = equipment.filter((a) => a === element)
        let filter = equipment.filter((a) => a !== findElement[0])
        filter.push(findElement[0])
        equipment = filter
      } else {
        let [equp, upgrade] = element.split("-")
        let modi = `${equp}:${upgrade}`
        let newArr = []
        for(let n of equipment) {
          newArr.push(n)
          if(n === equp) {
            newArr.push(modi)
          }
          equipment = newArr
        }
      }
    }
    console.log(equipment.join(" "))
  }