Envío 2454

Código

import java.util.Scanner;

/**
 *
 * @author usuario
 */
public class Main {

    public static void main(String[] args) throws java.lang.Exception {
        Scanner sc = new Scanner(System.in);
        int arraySize = sc.nextInt();
        int[] array = new int[arraySize];
        
        for(int i=0; i<arraySize; i++){
            int item = sc.nextInt();
            array[i] = item;
        }
        
        int index = -1;
        int left = 0;
        int right = 0;
        boolean isPosible = false;
        for(int i=0; i<array.length;i++){
            left=+array[i];
            right=-array[i];
            if(left>0 && right<0){
                isPosible = true;
                index = i;
                break;
            }

        }
        
        if(isPosible){
            System.out.println(index +1);                
        }else{
            System.out.println("Impossible");
        }

        
    }
}