#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	ifstream fin(argc[1]);
	int a,b;
	int wa;
	while( !fin.eof() ) {
		int count = 0;
		fin >> a >> b;
		wa = a + b;
		while(0){
			if(wa / 10 == 0){
				cout << count << endl;
				break;
			}
			wa/=10;
			count++;
		}
	}
	return 0;
}