#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
	long long int a = 0;
	long long int b = 0;
	while (cin >> a, cin >> b)
	{
		long long int c = a + b;
		int d = 1;
		while (c >= 10)
		{
			c /= 10;
			d++;
		}
		cout << d << endl;
	}
	
	return 0;
}