fun main(args: Array<String>) {
//    val sc = System.`in`.bufferedReader()
    val n = Integer.parseInt(readLine())
    val list = MyLinkedList<Int>()
    repeat(n) {
        val command = readLine()!!.split(" ")
        when (command[0]) {
            "insert" -> {
                list.insert(Integer.parseInt(command[1]))
            }
            "delete" -> {
                list.delete(Integer.parseInt(command[1]))
            }
            "deleteFirst" -> {
                list.deleteFirst()
            }
            "deleteLast" -> {
                list.deleteLast()
            }
        }
    }
    println(list)
}

class MyLinkedList<T> {
    private val nil: Element = Element(null)
    init {
        nil.next = nil
        nil.prev = nil
    }

    fun insert(value: T) {
        val element = Element(value)
        element.next = nil.next
        nil.next?.prev = element
        nil.next = element
        element.prev = nil
    }

    fun delete(value: T) {
        var element = nil.next
        while (element != nil) {
            if (element?.value == value) {
                element?.prev?.next = element?.next
                element?.next?.prev = element?.prev
                return
            }
            element = element?.next
        }
    }

    fun deleteFirst() {
        val element = nil.next
        nil.next = element?.next
        element?.next?.prev = nil
    }

    fun deleteLast() {
        val element = nil.prev
        nil.prev = element?.prev
        element?.prev?.next = nil
    }

    override fun toString(): String {
        var element = nil.next
        val strBuilder = StringBuilder()
        while (element != nil) {
            strBuilder.append(element?.value)
            strBuilder.append(" ")
            element = element?.next
        }
        strBuilder.deleteCharAt(strBuilder.lastIndex)
        return strBuilder.toString()
    }

    inner class Element(val value: T?) {
        var prev: Element? = null
        var next: Element? = null
    }
}

