#include<stdio.h>
#include<stdlib.h>
#define MAX 100
int top=-1;
int arr[MAX];

int isFull(){
    if(top==MAX-1)
        return 1;
    else
        return 0;
}

void push(int num){
    if(isFull())
        printf("full");
    else
        arr[++top]=num;
}

int isEmpty(){
    if(top==-1)
        return 1;
    else
        return 0;
}

void pop(){
    if (isEmpty())
         printf("Stack Underflow");
    else
         top--;
}

int peek(){
    if (isEmpty())
      printf("Stack Underflow");
      return 1;
    else
      return arr[top];
}

void display(){
    int i;
    for(int i=0;i<=top;i++){
    printf("%d",arr[i]);
    }
    printf("\n");
}

int main(){
    int size,i,num;
    char choice[20];
    scanf("%d\n",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<size;i++){
        scanf("%s",choice);
        if(strcmp(choice,"PUSH")==0){
            scanf("%d",&num);
            arr[++top]=num;
        }
        int found=0;
        for(i=0;i<=top;i++){
            found=0;
            for(j=0;j<ucount;j++){
                if(unique[j]==arr[i]){
                    found=1;
                    break;
                }
            }
            if(found==0){
                unique[ucount++]=arr[i];
            }
        }
for(i=0;i<ucount;i++){
    printf("%d\n",unique[i]);
}
return 0;
}