import java.util.*;
class main{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        if(n<=0){
             System.out.println("Invalid input");
        }
        int arr[]=new int[n];
        for(int i=0;i<n;i++){
            arr[i]=sc.nextInt();
        }
        int count=0;
        for(int i=0;i<n;i++){
            for(int j=i;j<n;j++){
                if(arr[i]==arr[j]){
                    if(i!=j){
                    System.out.println("("+i+", "+j+")");
                }
            }
        }
        }
        if(count=0){
            System.out.println("No good pairs");
        }
    }
}