#include <stdio.h>
int main() {
    int n;
    scanf("%d ", &n);
    if(n < 0) {
        printf("Invalid input");
        return 0;
    }
    int arr[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    for (int i = 0; i < n; i +=2) {
        printf("%d ", arr[i]);
    }
    for (int i = 1; i < n; i +=2){
        printf("d", arr[i]);
    }
    return 0;
}