#include<iostream>
#include<stdio.h>
#include<algorithm>
using namespace std;
int main()
{
	int c,g,a,b;
	while(1)
	{
		c=0;
		cin>>a>>b;
		if(a==EOF)
			break;
		g=a+b;
		while(1)
		{
			if(g/10>=1)
				c++;	
			else 
				break;
			g/=10;
		}		
		cout<<c+1<<endl;
	}
	return 0;
}