#nclude <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    
    if (n < 0) {
        printf(" -1");
        return 0;
    }
    
    int arr[1000];
    
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    
    for (int i =n -1; i >= 0; i--) {
        printf("%d", arr[i]);
    }
    
    return 0;
}