#include <iostream>
#include <algorithm>
#include <vector>
#include <functional>
#include <sstream>
using namespace std;

// Digit Number(0002)
int main()
{
	int a, b;
	while (cin >> a >> b) {
		stringstream ss;
		ss << a + b;

		cout << ss.str().length() << endl;
	}

	return 0;
}