//#include<iostream>
#include <fstream>

using namespace std;

ifstream cin("bomboane.in");
ofstream cout("bomboane.out");

struct bomboane
{
    int i,j,c;
}b[10001];

int main()
{
    int n,maxim=0,minim=10000,sum=0,c=0,pozmax=0,pozmin=0;
    int a[10001];
    cin>> n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        sum=sum+a[i];
    }

    if(sum%n!=0)
        cout<< -1;
    else
    {
        sum=sum/n;
        while(maxim!=minim)
        {
            maxim=0;
            minim=10000;
            for(int i=1;i<=n;i++)
            {
                if(a[i]>maxim)
                {
                    maxim=a[i];
                	pozmax=i;
                }
                if(a[i]<minim)
                {
                    minim=a[i];
                    pozmin=i;
                }
            }
            c++;
            b[c].i=pozmax;
            b[c].j=pozmin;
            b[c].c=sum-minim;
            a[pozmax]=maxim-(sum-minim);
            a[pozmin]=sum;
        }

        cout<< c-1 << endl;
        for(int i=1;i<c;i++)
        {
            cout<< b[i].i << " " << b[i].j << " " << b[i].c << endl;
        }
    }
    return 0;
}