백준 #4388번 받아올림

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		while(a != 0 || b != 0) {
			int count = 0;
			int sum = 0;
			while(a != 0 || b != 0) {
				sum = (sum / 10) + (a % 10) + (b % 10);
				if(sum >= 10) {
					count++;
				}
				a = a / 10;
				b = b / 10;
			}
			System.out.println(count);
			a = sc.nextInt();
			b = sc.nextInt();
		}
		sc.close();
	}
}