Problem: You are given an array a consisting of n integers. You can perform the following operations with it: 

  1. Choose some positions i and j (1 ≤ i, j ≤ n, i ≠ j), write the value of a_i ⋅ a_j into the j-th cell and remove the number from the i-th cell; 
  2. Choose some position i and remove the number from the i-th cell (this operation can be performed no more than once and at any point of time, not necessarily in the beginning). 



The number of elements decreases by one after each operation. However, the indexing of positions stays the same. Deleted numbers can't be used in the later operations.

Your task is to perform exactly n - 1 operations with the array in such a way that the only number that remains in the array is maximum possible. This number can be rather large, so instead of printing it you need to print any sequence of operations which leads to this maximum number. Read the output format to understand what exactly you need to print.

Input

The first line contains a single integer n (2 ≤ n ≤ 2 ⋅ 10^5) — the number of elements in the array.

The second line contains n integers a_1, a_2, ..., a_n (-10^9 ≤ a_i ≤ 10^9) — the elements of the array.

Output

Print n - 1 lines. The k-th line should contain one of the two possible operations.

The operation of the first type should look like this: 1~ i_k~ j_k, where 1 is the type of operation, i_k and j_k are the positions of the chosen elements.

The operation of the second type should look like this: 2~ i_k, where 2 is the type of operation, i_k is the position of the chosen element. Note that there should be no more than one such operation.

If there are multiple possible sequences of operations leading to the maximum number — print any of them.

Examples

Input

5
5 -2 0 1 -3


Output

2 3
1 1 2
1 2 4
1 4 5


Input

5
5 2 0 4 0


Output

1 3 5
2 5
1 1 2
1 2 4


Input

2
2 -1


Output

2 2


Input

4
0 -10 0 0


Output

1 1 2
1 2 3
1 3 4


Input

4
0 0 0 0


Output

1 1 2
1 2 3
1 3 4

Note

Let X be the removed number in the array. Let's take a look at all the examples:

The first example has, for example, the following sequence of transformations of the array: [5, -2, 0, 1, -3] → [5, -2, X, 1, -3] → [X, -10, X, 1, -3] → [X, X, X, -10, -3] → [X, X, X, X, 30]. Thus, the maximum answer is 30. Note, that other sequences that lead to the answer 30 are also correct.

The second example has, for example, the following sequence of transformations of the array: [5, 2, 0, 4, 0] → [5, 2, X, 4, 0] → [5, 2, X, 4, X] → [X, 10, X, 4, X] → [X, X, X, 40, X]. The following answer is also allowed: 
    
    
      
    1 5 3  
    1 4 2  
    1 2 1  
    2 3  
    

Then the sequence of transformations of the array will look like this: [5, 2, 0, 4, 0] → [5, 2, 0, 4, X] → [5, 8, 0, X, X] → [40, X, 0, X, X] → [40, X, X, X, X].

The third example can have the following sequence of transformations of the array: [2, -1] → [2, X].

The fourth example can have the following sequence of transformations of the array: [0, -10, 0, 0] → [X, 0, 0, 0] → [X, X, 0, 0] → [X, X, X, 0].

The fifth example can have the following sequence of transformations of the array: [0, 0, 0, 0] → [X, 0, 0, 0] → [X, X, 0, 0] → [X, X, X, 0].

Solution (in JAVA):

Solution:
//package sept;

import java.io.*;
import java.util.*;

public class CodeAgon {
    InputStream is;
    PrintWriter out;
    String INPUT = "";
    //boolean debug=true;
    boolean debug=false;
    
	void solve()
	{
		int n=ni();
		ArrayList<Pair> neg=new ArrayList<>();
		ArrayList<Pair> pos=new ArrayList<>();
		ArrayList<Pair> zer=new ArrayList<>();
		int maxNeg=Integer.MIN_VALUE;
		for(int i=0;i<n;i++)
		{
			int c=ni();
			if(c<0)
			{
				maxNeg=Math.max(maxNeg, c);
				neg.add(new Pair(c,i+1));
			}
			else if(c>0)
			{
				pos.add(new Pair(c,i+1));
			}
			else
			{
				zer.add(new Pair(c,i+1));
			}
		}
		if(neg.size()%2!=0)
		{
			for(int i=0;i<neg.size();i++)
			{
				if(maxNeg==neg.get(i).a)
				{
					zer.add(neg.get(i));
					neg.remove(i);break;
				}
			}
		}
		int last=-1,cnt=0;
		for(int i=1;i<neg.size();i++)
		{
			Pair curr=neg.get(i);
			Pair prev=neg.get(i-1);
			out.println(1+" "+prev.b+" "+curr.b);
			cnt++;
			last=curr.b;
		}
		if(pos.size()>0)last=pos.get(0).b;
		for(int i=1;i<pos.size();i++)
		{
			Pair curr=pos.get(i);
			Pair prev=pos.get(i-1);
			out.println(1+" "+prev.b+" "+curr.b);
			cnt++;
			last=curr.b;
		}
		if(neg.size()>0 && pos.size()>0)
		{
			out.println(1+" "+neg.get(neg.size()-1).b+" "+pos.get(pos.size()-1).b);
		}
		for(int i=1;i<zer.size();i++)
		{
			Pair curr=zer.get(i);
			Pair prev=zer.get(i-1);
			out.println(1+" "+prev.b+" "+curr.b);
			cnt++;
		}
		if(cnt==n-1)return;
		if(zer.size()>0)out.println(2+" "+zer.get(zer.size()-1).b);
	}
	static class Temp
	{
		int c;
		String s;
		public Temp(int c,String s)
		{
			this.c=c;
			char[] a;
			Arrays.sort((a=s.toCharArray()));
			this.s=new String(a);
		}
	}
	
	void solveE()
	{
		//tree construction for given max values of indices of two components
		int n=ni();
		int[] a=new int[n-1];
		for(int i=0;i<n-1;i++)
		{
			int u=ni(),v=ni();
			if(v!=n)
			{
				out.println("NO");
				return;
			}
			a[i]=u;
		}
		Arrays.sort(a);
		int l=0;
		int[] vis=new int[n+1];
		int curr=1;
		ArrayList<Pair> ans=new ArrayList<>();
		while(l<n-1)
		{
			int r=l+1;
			while(r<n-1 && a[l]==a[r])r++;
			int next=n;
			while(l<r-1)
			{
				while(vis[curr]==1)curr++;
				ans.add(new Pair(curr,next));
				next=curr;
				vis[curr]=1;
				l++;
			}
			if(vis[a[l]]==1)
			{
				out.println("NO");
				return;
			}
			ans.add(new Pair(next,a[l]));
			vis[a[l]]=1;
			l++;
		}
		out.println("YES");
		for(Pair p:ans)
		{
			out.println(p.a+" "+p.b);
		}
		out.println();
	}
	
	static int[][] packD(int n, int[] from, int[] to) {
		int[][] g = new int[n][];
		int[] p = new int[n];
		for (int f : from)
			p[f]++;
		for (int i = 0; i < n; i++)
			g[i] = new int[p[i]];
		for (int i = 0; i < from.length; i++) {
			g[from[i]][--p[from[i]]] = to[i];
		}
		return g;
	}
	    
    static class Pair
    {
        int a,b;
        public Pair(int a,int b)
        {
            this.a=a;
            this.b=b;
        }
    }
    
    static long lcm(int a,int b)
    {
        long val=a;
        val*=b;
        return (val/gcd(a,b));
    }
    
    static long gcd(long a,long b)
    {
        if(a==0)return b;
        return gcd(b%a,a);
    }
    
    static int pow(int a, int b, int p)
    {
        long ans = 1, base = a;
        while (b!=0)
        {
            if ((b & 1)!=0)
            {
                ans *= base;
                ans%= p;
            }
            base *= base;
            base%= p;
            b >>= 1;
        }
        return (int)ans;
    }

    static int inv(int x, int p)
    {
        return pow(x, p - 2, p);
    }

    
    void run() throws Exception
    {
        if(!debug)oj=true;
        is = oj ? System.in : new ByteArrayInputStream(INPUT.getBytes());
        out = new PrintWriter(System.out);
        
        long s = System.currentTimeMillis();
        solve();
        out.flush();
        tr(System.currentTimeMillis()-s+"ms");
    }
    
    public static void main(String[] args) throws Exception {new CodeAgon().run();}
    
    private byte[] inbuf = new byte[1024];
    public int lenbuf = 0, ptrbuf = 0;
    
    private int readByte()
    {
        if(lenbuf == -1)throw new InputMismatchException();
        if(ptrbuf >= lenbuf){
            ptrbuf = 0;
            try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
            if(lenbuf <= 0)return -1;
        }
        return inbuf[ptrbuf++];
    }
    
    private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
    private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
    
    private double nd() { return Double.parseDouble(ns()); }
    private char nc() { return (char)skip(); }
    
    private String ns()
    {
        int b = skip();
        StringBuilder sb = new StringBuilder();
        while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    
    private char[] ns(int n)
    {
        char[] buf = new char[n];
        int b = skip(), p = 0;
        while(p < n && !(isSpaceChar(b))){
            buf[p++] = (char)b;
            b = readByte();
        }
        return n == p ? buf : Arrays.copyOf(buf, p);
    }
    
    private char[][] nm(int n, int m)
    {
        char[][] map = new char[n][];
        for(int i = 0;i < n;i++)map[i] = ns(m);
        return map;
    }
    
    private int[] na(int n)
    {
        int[] a = new int[n];
        for(int i = 0;i < n;i++)a[i] = ni();
        return a;
    }
    
    private int ni()
    {
        int num = 0, b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private long nl()
    {
        long num = 0;
        int b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private boolean oj = System.getProperty("ONLINE_JUDGE") != null;
    private void tr(Object... o) { if(!oj)System.out.println(Arrays.deepToString(o)); }
}