/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
class solution
{
public static void main (String[] args)
{
int[] nums={1,7,5,1,9,2,5,1};
int[] res=new int[nums.length];
Nextgreat(nums, res);
for (int e: res)
System.out.println(e);
}
public static void Nextgreat(int[] nums, int[] res)
{
Stack<Integer>stack=new Stack<>();
for (int i=0; i<nums.length; i++)
   {
    while (!stack.isEmpty()&&nums[stack.peek()]<nums[i])
         res[stack.pop()]=nums[i];
    stack.push(i);
   }
}
}
 
 

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