#include <iostream>
int main()
{
	int a;
	int b;
	while(std::cin >> a >> b)
	{
		int number = 1;
		int data = a + b;
		for(int i = 0;;i++)
		{
			if(data / 10 != 0)
			{
				number += 1;
				data /= 10;
			}

			else if(data / 10 == 0)
			{
				break;
			}
		}
		std::cout << number << '\n';
	}
}