#include <iostream>
using namespace std;
int main(){
int t,n,sl;
string b,slowo=" ";
char l;
cin>>t;
for(int i=0;i<t;i++){
cin>>b;
sl=slowo.length()-1;
if(b=="DODAJ"){
cin>>l;
if(slowo[sl]!=0){
slowo=slowo+l;
}
else{
slowo[sl]=l;
}
}
else if(b=="USUN"){
cin>>n;
for(int j=0;j<n;j++){
if(sl-j>=0){
slowo[sl-j]=0;
}
}
}
else if(b=="ZAMIEN"){
cin>>l;
if(slowo.length()>1){
slowo[sl]=l;
}
}
}
for(int i=0;i<sl+2;i++){
if(t==0){
break;
}
if(slowo[i]!=32&&slowo[i]!=0){
cout<<slowo[i];
}
}
}
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