** using the two pointer approach

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner sc = new Scanner(System.in);
    String str = sc.next();

    boolean check = check_palindrome(str);

    if(check == true){
        System.out.println("Yes");
    }else{
        System.out.println("No");
    }

}

public static boolean check_palindrome(String str){
    int left = 0;
    int right = str.length() - 1;

    while(left < right){
        if(str.charAt(left) != str.charAt(right)){
            return false;
        }
        left++;
        right--;
    }
    return true;
}

}