#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <string>
#include <functional>
#include <numeric>
#include <ctype.h>
#include <cstdlib>
#include <string.h>
#include <cmath>
#include <cstdio>





using namespace std;


int main()
{
	int a, b;

	string str;

	while (cin >> a >> b)
	{

		int sum = a + b;

		str = to_string(sum);

		cout << str.size() << endl;

		
	}


}