#include <bits/stdc++.h>
#include <vector>
using namespace std;
char letters[100001];
int main()
{
int i;
while ( scanf ("%s", &letters) != EOF ) {
int l = strlen (letters);
list <char>beiju;
list <char>::iterator it = beiju.begin();
for ( i = 0; i < l; i++ ) {
if ( letters [i] == '[' ) it = beiju.begin();
else if ( letters [i] == ']' ) it = beiju.end();
else beiju.insert(it, letters [i]);
}
for ( it =beiju.begin(); it != beiju.end(); it++ )
printf("%c",*it);
printf ("\n");
}
return 0;
}