#include<iostream>
using namespace std;


int main()
{
   int a,b;
   int keta = 1;
   int i;
  
   cin >> a >> b;
   while(!cin.eof())
     {
       a+=b;
       while(a>=10){
         a/=10;
         keta++;
       }
       cout << keta << endl;
       cin >> a >> b;
       keta = 1;
     }
  
   return 0;
}