#include <bits/stdc++.h>
using namespace std;
int main(){
string s;
cin >> s;
string result = "";
for(size_t i = 1; i<s.length()+1;i++){
if(s[i]=='B'){
s[i]='m';
s[i-1]='m';
}
}
for(size_t i=0;i<s.length()+1;i++){
if(s[i]!='m'){
result+=s[i];
}
}
cout << result;
}
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