#include <stdio.h>

int count_1(int m ,int n)//计算进位数
{
    int count = 0, a = 0;
    while (m != 0 || n != 0)
    {
        int sum = m % 10 + n % 10 + a;
        a = 0;//初始化进位
        if (sum >= 10)
        {
            count++;//进位计数
            a++;//如果产生进位，将进位记录
        }
        m /= 10;
        n /= 10;//计算下一位
    }
    return count;
}

int main()
{
    int m, n;
    while (1)
    {
        scanf("%d %d", &m, &n);
        if (m == 0 && n == 0)
        {
            break;//读取到0 0跳出循环
        }
        printf("%d\n", count_1(m, n));
    }

    return 0;//好孩子的好习惯
}

#include <stdio.h>

int main()
{
	int m, n;
	while (1)
	{
		scanf("%d %d", &m, &n);
		
		if (m == 0 && n == 0)
		{
			break;
		}
		
		int count = 0; //进位次数
		int Over = 0;
		
		for (int i = 0; i < 3; i++)
		{
			int M_gewei = m % 10;
			int N_gewei = n % 10;
			int sum = M_gewei + N_gewei + Over;
			// 判断是否进位
			if (sum >= 10)
			{
				count++;
				Over = 1;
			}
			else
			{
				Over = 0;
			}
			// 去掉已经处理过的位
			m /= 10;
			n /= 10;
		}
		printf("%d\n", count);
	}
	
	return 0;
}