#include<stdio.h>
#define MAX 100
int queue[MAX];
int front=-1,rear=-1;
void enqueue(int x,int n)
{
    if (rear == n-1){
        reutrn;
    }
    if (front == -1){
        front= 0;
    }
    queue[++rear]=x;
}
void display(){
    if(front == -1){
        return;
    }
    for (int i=front;i<=rear;i++){
        printf("%d",queue[i]);
    }
}
int main(){
    int n,i,x;
    scanf("%d",&n);
    if(n<0||n>MAX){
        printf("invalid input");
        return 0;
    }
    for(i=0;i<n;i++)
    {
        scanf("%d",&x);
        enqueue(x,n);
    }
    display();
    return 0;
}