import java.util.ArrayDeque
import java.util.StringTokenizer
 
fun main() {
    val br = System.`in`.bufferedReader() 
    val t = br.readLine().toInt()
 
    repeat(t) {
        val command = br.readLine()
        val n = br.readLine().toInt()
        val arrStr = br.readLine()
        val arr = StringTokenizer(arrStr.substring(1, arrStr.length - 1), ",")
        val deque = ArrayDeque<Int>()
 
        var error = false
        var reversed = false
        loop@ for (c in command) {
            when (c) {
                'R' -> reversed = !reversed
                'D' -> {
                    if (deque.isEmpty()) {
                        error = true
                        break@loop
                    }
 
                    if (reversed) {
                        deque.removeLast()
                    } else {
                        deque.removeFirst()
                    }
                }
            }
        }
 
        if (error) {
            println("error")
        } else {
            val sb = StringBuilder()
            sb.append("[")
            if (reversed) {
                for (i in 0 until deque.size) {
                    sb.append("${deque.removeLast()},")
                }
            } else {
                for (i in deque.size - 1 downTo 0) {
                    sb.append("${deque.removeFirst()},")
                }
            }
            sb.append("]")
            println(sb)
        }
    }
}

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NApSREQKNApbMSwyLDMsNF0KREQKMQpbNDJdClJSRAo2ClsxLDEsMiwzLDUsOF0KRAowCltd

4
RDD
4
[1,2,3,4]
DD
1
[42]
RRD
6
[1,1,2,3,5,8]
D
0
[]