#include<iostream>
using namespace std;

int main(){
  int a,b;
    while(cin >> a >> b){
      int x=a+b;
    int count=0,i;
    for(i=1;i<=1000000;i*=10){
      if(x/i>=1){
	count++;
      }
      if(x/i<0){
	break;
      }
    }
    cout << count << endl;

  }





 return 0;
}