// Java program for the above approach

import java.io.*;

import java.lang.*;

import java.util.*;

class GFG {

// Function to check if the given array

// is mountain array or not

static Boolean isMountainArray(int arr[])

{

    if (arr.length < 3)

        return false;

    int flag = 0, i = 0;

    for (i = 1; i < arr.length; i++)

        if (arr[i] <= arr[i - 1])

            break;

    if (i == arr.length || i == 1)

        return false;

    for (; i < arr.length; i++)

        if (arr[i] >= arr[i - 1])

            break;

    return i == arr.length;

}

// Driver Code

    public static void main (String[] args) {

           int arr[] = { 1, 2, 3, 4, 9,

            8, 7, 6, 5 };

       System.out.println(isMountainArray(arr)

                 ? "true"

                 : "false");

    }

}

// This code is contributed by hrithikgarg03188.