Problem: According to an old legeng, a long time ago Ankh-Morpork residents did something wrong to miss Fortune, and she cursed them. She said that at some time n snacks of distinct sizes will fall on the city, and the residents should build a Snacktower of them by placing snacks one on another. Of course, big snacks should be at the bottom of the tower, while small snacks should be at the top.

Years passed, and once different snacks started to fall onto the city, and the residents began to build the Snacktower.

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However, they faced some troubles. Each day exactly one snack fell onto the city, but their order was strange. So, at some days the residents weren't able to put the new stack on the top of the Snacktower: they had to wait until all the bigger snacks fell. Of course, in order to not to anger miss Fortune again, the residents placed each snack on the top of the tower immediately as they could do it.

Write a program that models the behavior of Ankh-Morpork residents.

Input

The first line contains single integer n (1 ≤ n ≤ 100 000) — the total number of snacks.

The second line contains n integers, the i-th of them equals the size of the snack which fell on the i-th day. Sizes are distinct integers from 1 to n. 

Output

Print n lines. On the i-th of them print the sizes of the snacks which the residents placed on the top of the Snacktower on the i-th day in the order they will do that. If no snack is placed on some day, leave the corresponding line empty.

Examples

Input

3
3 1 2


Output

3
 
2 1

Input

5
4 5 1 2 3


Output

 
5 4
 
 
3 2 1

Note

In the example a snack of size 3 fell on the first day, and the residents immediately placed it. On the second day a snack of size 1 fell, and the residents weren't able to place it because they were missing the snack of size 2. On the third day a snack of size 2 fell, and the residents immediately placed it. Right after that they placed the snack of size 1 which had fallen before.

Solution (in JAVA):

Solution:
	import java.util.*;
    import java.io.*;
    public class problem2 {
    	public static void merge(int arr[], int l, int m, int r) 
        { 
            // Find sizes of two subarrays to be merged 
            int n1 = m - l + 1; 
            int n2 = r - m; 
      
            /* Create temp arrays */
            int L[] = new int [n1]; 
            int R[] = new int [n2]; 
      
            /*Copy data to temp arrays*/
            for (int i=0; i<n1; ++i) 
                L[i] = arr[l + i]; 
            for (int j=0; j<n2; ++j) 
                R[j] = arr[m + 1+ j]; 
      
      
            /* Merge the temp arrays */
      
            // Initial indexes of first and second subarrays 
            int i = 0, j = 0; 
      
            // Initial index of merged subarry array 
            int k = l; 
            while (i < n1 && j < n2) 
            { 
                if (L[i] <= R[j]) 
                { 
                    arr[k] = L[i]; 
                    i++; 
                } 
                else
                { 
                    arr[k] = R[j]; 
                    j++; 
                } 
                k++; 
            } 
      
            /* Copy remaining elements of L[] if any */
            while (i < n1) 
            { 
                arr[k] = L[i]; 
                i++; 
                k++; 
            } 
      
            /* Copy remaining elements of R[] if any */
            while (j < n2) 
            { 
                arr[k] = R[j]; 
                j++; 
                k++; 
            } 
        } 
      
        // Main function that sorts arr[l..r] using 
        // merge() 
        public static void sort(int arr[], int l, int r) 
        { 
            if (l < r) 
            { 
                // Find the middle point 
                int m = (l+r)/2; 
      
                // Sort first and second halves 
                sort(arr, l, m); 
                sort(arr , m+1, r); 
      
                // Merge the sorted halves 
                merge(arr, l, m, r); 
            } 
        } 
    	public static void main(String[] args) throws IOException {
    		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    		int n = Integer.parseInt(br.readLine());
    		boolean arr[] = new boolean[n+5];
    		StringTokenizer st = new StringTokenizer(br.readLine());
    		int m = n;
    		for(int i=0;i<n;i++) {
    			int b = Integer.parseInt(st.nextToken());
    			arr[b] = true;
    			boolean isf = true;
    			while(arr[m]) {
    				if(!isf)System.out.print(" ");
    				System.out.print(m);
    				m--;
    				isf = false;
    			}
    			System.out.println();
    		}
        }
     
    }