#include<iostream>

using namespace std;

int main()
{
	int num[2];
	int numLength = sizeof(num) / sizeof(num[0]);
	int n;
	int sum;
	while(1){
		n = 1;
		sum = 0;
		
		int h;
		for(h = 0; h < numLength; h++)
		{
			cin >> num[h];
			sum += num[h];
		}
		
		while(sum/10 != 0){
			n++;
			sum = sum / 10;
		}
		
		cout << n << endl;
		
	}
	return(0);
}