#include <sstream>

#include<string>
#include<algorithm>
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	int a, b;
	while (cin>>a>>b)
	{
		int c = a + b;
		string x = to_string(c);
		cout << x.size() << endl;
	}
	return 0;

}