import java.io.; import java.math.; import java.security.; import java.text.; import java.util.; import java.util.concurrent.; import java.util.regex.*;

public class Solution {

// Complete the beautifulDays function below.

static int beautifulDays(int i, int j, int k) {
    int c=0,num;
    int revno=0;
    int temp,gn;
    for(int l=i;l<=j;l++)
    {
        num=l;
        temp=0;
        while(num!=0)
        {
            temp=num%10;
            revno=revno*10+temp;
            num=num/10;
        }
        gn=Math.abs(l-revno);
        if(gn%k == 0)
        {
            c++;
        }

    } return c;

    }

private static final Scanner scanner = new Scanner(System.in);

public static void main(String[] args) throws IOException {
    BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

    String[] ijk = scanner.nextLine().split(" ");

    int i = Integer.parseInt(ijk[0]);

    int j = Integer.parseInt(ijk[1]);

    int k = Integer.parseInt(ijk[2]);

    int result = beautifulDays(i, j, k);

    bufferedWriter.write(String.valueOf(result));
    bufferedWriter.newLine();

    bufferedWriter.close();

    scanner.close();
}

}

(I followed the same approach then why ist showing wrong answer??)