#include <iostream>
#include <sstream>
#include <string>
#include <vector>

using namespace std;

int main(){
  int a,b;
  stringstream c;
  vector<int> d;
  while(cin >> a >> b){
    c.str("");
    c << a+b;
    string str = c.str();
    d.push_back(str.length());
  }

  for(int i=0; i<d.size(); i++){
    cout << d[i] << endl;
  }

  return 0;
}