#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007

using namespace std;

int main(void) {
	int a, b;
	int c;
	FOR(i, 1, 200) {
		cin >> a >> b;
		c = a + b;
		FOR(i, 1, 100) {
			c /= 10;
			if (c == 0) {
				cout << i << endl;
				break;
			}
		}
	}
	return 0;
}