#include <iostream>
#include <string>
#include <vector>
#include <sstream>
using namespace std;
int main()
{

	string str;
	do
	{

		string item;
		vector<string> list;
		getline(cin, str);
		if (str == "")
		{
			break;
		}

		stringstream ss(str);
		while (getline(ss, item, ' ') && !item.empty()) {
			list.push_back(item);
		}
		int sum = stoi(list[0].c_str()) + stoi(list[1].c_str());
		int count = 0;
		for (int i = 10; i <= 1000000; i = i * 10)
		{
			count++;
			if(sum < i)
			{
				cout << count << endl;
				break;
			}


		}
	} while (str != "");
	return 0;
}