y_q3

import java.util.Scanner;

public class Q3 {

	public static void main(String[] args) {
		int sum = 0;
		Scanner in = new Scanner(System.in);
		System.out.println("enter first number(3 digits long):");
		int num1 = in.nextInt();
		System.out.println("enter second number(3 digits long):");
		int num2 = in.nextInt();
		sum = Math.abs(num1%10 - num2%10)+
				Math.abs(num1%100/10 - num2%100/10) + Math.abs(num1/100 - num2/100);
		System.out.println(sum);

	}

}