#include<iostream>
#include<string>


using namespace std;

int main()
{
	
	int a,b;
	string input;
	int size[3];
	int i = 0;
	int count = 0;	
	//cout << "input two numbers" << endl;
	for(i=0;i<200;i++){
	cin >> a >> b;
	b += a;
	input = to_string(b);
	size[i] = input.size();	
	count++;
}
for(i=0;i < count;i++){
	cout << size[i] << endl;
}

}