
#include <iostream>

using namespace std;

int main(){
      long int a,b,sum;
int i,j;
while(cin>>a>>b)
    {
    sum=a+b;
    for(j=0;sum>0;j++)
    {
        sum=sum/10;
        }
    cout<<j<<endl;
        }
    system("PAUSE");
    return 0;
}