Problem:
Score : 200 points

Problem Statement

Sig has built his own keyboard. Designed for ultimate simplicity, this keyboard only has 3 keys on it: the 0 key, the 1 key and the backspace key.

To begin with, he is using a plain text editor with this keyboard. This editor always displays one string (possibly empty). Just after the editor is launched, this string is empty. When each key on the keyboard is pressed, the following changes occur to the string:

The 0 key: a letter 0 will be inserted to the right of the string.

The 1 key: a letter 1 will be inserted to the right of the string.

The backspace key: if the string is empty, nothing happens. Otherwise, the rightmost letter of the string is deleted.

Sig has launched the editor, and pressed these keys several times. You are given a string s, which is a record of his keystrokes in order. In this string, the letter 0 stands for the 0 key, the letter 1 stands for the 1 key and the letter B stands for the backspace key. What string is displayed in the editor now?

Constraints

1 ≦ |s| ≦ 10 (|s| denotes the length of s)

s consists of the letters 0, 1 and B.

The correct answer is not an empty string.

Input

The input is given from Standard Input in the following format:

s

Output

Print the string displayed in the editor in the end.

Sample Input 1

01B0

Sample Output 1

00

Each time the key is pressed, the string in the editor will change as follows: 0, 01, 0, 00.

Sample Input 2

0BB1

Sample Output 2

1

Each time the key is pressed, the string in the editor will change as follows: 0, (empty), (empty), 1.

Solution in C (GCC 9.2.1) (judge verdict: Accepted)

/* ex 9_1
   Sagzar1993 */

#include <stdio.h>
#include <stdlib.h>
//スタックに格納するデータの最大数
#define SIZE 1000

//スタックの定義
typedef struct stack{
    int size;
    int count;
    char data[SIZE];
    char *top;
} stack;

//スタックの初期化
void initialize_stack(stack *stk){
    stk->count = 0;
    stk->size = SIZE;
    stk->top = &(stk->data[SIZE]);
}

//データの追加
void push(stack *stk, char elem){
    if(stk->count >= stk->size){
        fprintf(stderr, "Error: stack overflow. (x=%c)\n", elem);
        exit(1);
    }
    else{
        stk->top--;
        *(stk->top) = elem;
        stk->count++;
    }
}

//データの取り出し
char pop(stack *stk){
    char latest;
    if(stk->count <= 0){
        fprintf(stdout, "Error: stack underflow.\n");
        exit(1);
    }
    else{
        latest = *(stk->top);
        stk->top++;
        stk->count--;
        return latest;
    }
}

int main(void){
    stack keyStk; //表示される文字を保存するスタック
    int i;
    char inputKey;
    //スタックを初期化
    initialize_stack(&keyStk);

    //１文字ずつ入力してスタックを操作
    while(1){
        scanf("%c", &inputKey);
        if(inputKey == '\n'){
            //文字列の最後に来たら終了
            break;
        }else if(inputKey != 'B'){
            //0か1ならスタックに文字を追加
            push(&keyStk, inputKey);
        }else if(keyStk.count > 0){
            //Bのとき、スタックが空でなければ最後に追加した文字を取り出し
            pop(&keyStk);
        }
    }
    //スタックの古い方から出力
    for(i = 0; i < keyStk.count; i++){
        printf("%c", keyStk.data[SIZE - 1 - i]);
    }
    printf("\n");
    return 0;
}