/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in=new Scanner(System.in);
		int n;
		System.out.println("Enter no of elements");
		n=in.nextInt();
		int[] arr=new int[n];
		System.out.println("Enter elements");
		for(int i=0;i<n;i++)
		arr[i]=in.nextInt();
 
		for(int i=0;i<n;i++){
			for(int j=i+1;j<n;j++){
				if(arr[i]==arr[j]){
				System.out.println(+i);
				return;
				}
				else
				System.out.println("-1");
 
			}
 
		}
 
	}
}

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NyAxIDIgMyAyIDUgNCAz

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