Using "Two Pointers Technique":

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

public class Solution {

public static void main(String[] args) {

    Scanner sc=new Scanner(System.in);
    String A=sc.next();
    int left = 0, right = A.length()-1;

    while(left < right) {
        if(A.charAt(left) != A.charAt(right)) {
            System.out.println("No");
            return;
        }
        left++;
        right--;
    }

    System.out.println("Yes");
}

}