#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++){
				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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

MTIKRE9EQUogQQpaQU1JRU4gUApET0RBSiBCClpBTUlFTiBPCkRPREFKIEMKWkFNSUVOIE0KRE9EQUogSwpaQU1JRU4gTwpET0RBSiBGClpBTUlFTiBDCkRPREFKIEcKWkFNSUVOIFk=

12
DODAJ A
ZAMIEN P
DODAJ B
ZAMIEN O
DODAJ C
ZAMIEN M
DODAJ K
ZAMIEN O
DODAJ F
ZAMIEN C
DODAJ G
ZAMIEN Y