#include <bits/stdc++.h>
#include <string>

using namespace std;

int main()
{
   int n;
   cin >> n;

   vector<int> v(n);
   for(int i = 0; i < n; i++) {
       cin >> v[i];
       v[i]--;
   }
   vector<bool> b(n);

   vector<string> s;
   int ind = 0;

   for(int i = 0; i < n; i++) {
       if(b[i] == false) {
           int j = i;
           b[j] = true;
           string str(to_string(j + 1) + " -> " + to_string(v[j] + 1));
           while(v[j] != i){
               j = v[j];
               b[j] = true;
               if(v[j] != i) str += " -> " + to_string(v[j] + 1);
           }
           s.push_back(str);
           ind++;
       }
   }
   cout << ind << endl;
   for(int i = 0; i < ind; i++) {
       cout << s[i] << endl;
   }
}