How to find Prime String in very simple manner (Codings long) in java by jayanthi ganesh

import java.util.*;

public class ASCIIPracticeThree {
public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);  
    String s = sc.nextLine();
    System.out.println(s);
    System.out.println(s.charAt(0));
    System.out.println(s.charAt(2));
    System.out.println(s.charAt(1));
    System.out.println(s.charAt(3));
    char a = s.charAt(0);
    char b = s.charAt(1);
    char c = s.charAt(2);
    char d = s.charAt(3);
    System.out.println(s);
    System.out.println(a);
    System.out.println(b);
    System.out.println(c);
    System.out.println(d);
    int a1 = a;
    int b1 = b;
    int c1 = c;
    int d1 = d;
    System.out.println(s);
    System.out.println(a1);
    System.out.println(b1);
    System.out.println(c1);
    System.out.println(d1);
    int Total = a1+c1;
    int TotalOne = b1+d1;
    int Diff = TotalOne-Total;
    System.out.println(Total);
    System.out.println(TotalOne);
    System.out.println(Diff);
    if (Diff%3==0)
    System.out.println("Its a prime string");
    else
    System.out.println("Its a casual string");
    
}

}