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1406.cpp
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1406.cpp
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import java.io.BufferedReader
import java.io.InputStreamReader
import java.util.*
fun main() = with(BufferedReader(InputStreamReader(System.`in`))){
var s = readLine()
val lst = Stack<Char>()
var rst = Stack<Char>()
for(a in s) lst.push(a)
for(i in 1..readLine().toInt()) {
var ip = readLine().split(' ')
when (ip[0]) {
"L" -> if(!lst.empty()) rst.push(lst.pop())
"D" -> if(!rst.empty()) lst.push(rst.pop())
"B" -> if(!lst.empty()) lst.pop()
else -> {
lst.push(ip[1][0])
}
}
}
println(lst.toCharArray()+rst.toCharArray().reversed())
}
// /
// import java.io.BufferedReader
// import java.io.InputStreamReader
// import java.lang.StringBuilder
// import java.util.*
// fun main() = with(BufferedReader(InputStreamReader(System.`in`))){
// var s = readLine()
// var list = LinkedList<Char>()
// for(a in s) list.add(a)
// var it = list.listIterator()
// while(it.hasNext()) it.next()
// var n = readLine().toInt()
// for(i in 1..n) {
// var ip = readLine().split(' ')
// when (ip[0]) {
// "L" -> if (it.hasPrevious()) it.previous()
// "D" -> if (it.hasNext()) it.next()
// "B" -> {
// if (it.hasPrevious()) {
// it.previous()
// it.remove()
// }
// }
// else -> it.add(ip[1][0])
// }
// }
// println(list.toCharArray())
// }