#include <cstdio>
#include <climits>
#include <cstring>

void print(const int *array, int size)
{
        for (int i = 0; i < size - 1; ++i)
                printf("%d ", array[i]);
        printf("%d\n", array[size - 1]);
}

int main()
{
        int k;
        scanf("%d", &k);
        k--;

        int *elements = new int[k];
        int *p = new int[k];

        //memset(elements, 0, sizeof(*elements) * k);
        for (int i = 0; i < k; ++i) {
                elements[i] = 1;
        }

        memset(p, 0, sizeof(*p) * k);

        /*
        for (int i = 0; i < k; ++i) {
                printf("%d %d\n", elements[i], p[i]);
        }
        */

        int num = 0;
        while (scanf("%d", &num) != EOF && num != -1) {
                if (num) {
                        bool updated = false;
                        for (int i = 0; i < k; ++i) {
                                if (p[i] == 0 || elements[i] == num) {
                                        ++p[i];
                                        elements[i] = num;
                                        updated = true;
                                        break;
                                }
                        }

                        if (!updated) {
                                for (int i = 0; i < k; ++i)
                                        --p[i];
                        }

                } else {
                        print(elements, k);
                }
        }

        delete[] elements;
        delete[] p;

        return 0;
}