#include "stdafx.h"
#include <iostream>


using namespace std;

int a, b;

void solve()
{
	int res = 0;

	a += b;

	for (; a; a /= 10)
		res++;

	cout << res << endl;
}

int main()
{
	while (cin >> a >> b)
		solve();

	return 0;
}