#include <bits/stdc++.h>

using namespace std;
const int N = 200010;
int n, cnt;
int a[N];
bool st[N];

int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) scanf("%d", &a[i]);

    while (cnt < n) {
        int last = 2;
        for (int i = 1; i <= n; i++) {
            if (!st[i] && a[i] != last) {
                last = a[i];
                st[i] = true;
                printf("%d ", i);
                cnt++;
            }
        }
        puts("");
    }
    return 0;
}