#include <stdio.h>
int main()
{
    int n1,n2,a,b,count;
    count=0;
    scanf("%d %d",&n1,&n2);
    while(n1!=0&&n2!=0)
    {
        a=n1,b=n2;
        while(a!=0&&b!=0)
        {
            if(a%10+b%10>=10)
            {
                count++;
                a/=10;
                b/=10;
                a+=1;
            }
            else
            {
                a/=10;
                b/=10;
            }
        }
        printf("%d\n",count);
        count=0;
        scanf("%d %d",&n1,&n2);
    }
    return 0;
}
😕