public class VMwareOA {
	public static int distance(int a, int b) {
		int res = 0;
		while (a > 0 && b > 0) {
			res += Math.abs(a % 10 - b % 10);
			a /= 10;
			b /= 10;
		}
		return res;
	}

	public static void main(String[] args) {
		// Testcase1: 3
		System.out.println(distance(133,343));
		// Testcase2: 4
		System.out.println(distance(1234,1221));

	}

}