#include<iostream>
using namespace std;
int main()
{
   long a,b,s,c,i;
   while(cin >> a >> b)
     {
        c=1;
        s = a+b;
        while(s < 10)
         {
             s = s /10;
             c++;
         }
         cout << c << endl;
     }
    return 0;
}
        