#include<stdio.h>
#include<stdlib.h>

int top = -1, size=25;
int arr[25];

int isFull(){
    return top == size-1;
       
}
int isEmpty(){
    return top == -1;
}
void PUSH(int num){
    if(isFull()){
        printf("Stack is Full\n");
        return;
    }
    for(int i=0;i<=top;i++){
        if(arr[i]==num){
          return;  
        }
    }
    
        arr[++top]=num;
}

void POP(){
    if(isEmpty()){
        printf("Stack is Empty\n");
    }
    else{
        top--;
    }
}
int peek(){
    if(isEmpty()){
        return -1;
    }
     return arr[top];
    
}
void DISPLAY(){
    if(isEmpty()){
        printf("Stack is empty");
    }
    else{
        for(int i=top;i>=0;i--){
            printf("%d",arr[i]);
        }
    }
    
}

int main(){
    int size,choice,num;
    
    if(!scanf("%d",&size)|| size<=0){
        printf("Invalid input");
        return 0;
    }
    printf("%d",n);
    for(int i=0;i<size;i++){
       if( !scanf("%d",&num) ){
           printf("Invalid input");
           return 0;
       }        
       PUSH(num);
    }
    

    DISPLAY();
    return 0;
    
    
}