#include<stdio.h>
int main() {
    int n;
    scanf("%d",&n);
    if(n < 0){
        printf("-1");
        return 0;
    }
    int arr[n];
    for (i=0;i<n;i++){
      scanf("%d",&arr[i]);
    }
    for (i=n-1;i>=0;i--){
      printf("%d",arr[i]);
    }
    return 0;
}