import java.util.LinkedList
import java.util.StringTokenizer
 
fun main() {
    val br = System.`in`.bufferedReader()
    val queue = LinkedList<String>()
 
    val str = br.readLine()
    val m = br.readLine().toInt()
 
    var index = 0
    repeat(m) {
        val token = StringTokenizer(br.readLine())
        when (token.nextToken()) {
            "L" -> { if (index > 0) index-- }
            "D" -> { if (index < queue.size) index++ }
            "B" -> {
                if (index > 0) {
                    index--
                    queue.removeAt(index)
                }
            }
            "P" -> {
                queue.add(index, token.nextToken()) 
                index++
            }
        }
        println(queue)
    }
 
    val sb = StringBuilder()
    for (c in queue) {
        sb.append(c)
    }
    println(sb)
}

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YWJjCjkKTApMCkwKTApMClAgeApMCkIKUCB5

abc
9
L
L
L
L
L
P x
L
B
P y