#include <iostream>
using namespace std;
int main(){
	int t,n=0,sl,czyusun=0;
	string b,slowo=" ";
	char l;
	cin>>t;
	for(int i=0;i<t;i++){
		cin>>b;
		sl=slowo.length()-1;
		if(b=="DODAJ"){
			czyusun=0;
			cin>>l;			
			if(slowo[sl]!=0){
				slowo=slowo+l;
			}
			else{
				slowo[sl]=l;
			}
 
		}
		else if(b=="USUN"){
			cin>>n;	
			czyusun=1;
			for(int j=0;j<n;j++){
				if(sl-j>=0){
					slowo[sl-j]=0;
				}
			}
		}
		else if(b=="ZAMIEN"){
			cin>>l;
			if(sl>1&&slowo[0]>0||sl>1&&slowo[0]==32){
				if(n<sl){
					slowo[sl-n]=l;
				}
			}
			czyusun=0;
 
		}
 
	}
	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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NApET0RBSiBBClpBTUlFTiBUClVTVU4gMTAKWkFNSUVOIEI=

4
DODAJ A
ZAMIEN T
USUN 10
ZAMIEN B