#include<iostream>

using namespace std;

int z,x,y;
int main(){
 cin>>x>>y;
 z=x+y;
if(z<10){
	cout<<1<<endl;}
else
 if(z<100){
 	cout<<2<<endl;}
 else
  if(z<1000){
  	cout<<3<<endl;}
  else
   if(z<10000){
   	cout<<4<<endl;}
   else
    if(z<100000){
     cout<<5<<endl;}
    else
     if(z<1000000){
      cout<<6<<endl;}
     else
      cout<<7<<endl;

return 0;
	
}