#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define fi first
#define se second
#define ll long long
#define pb push_back

# define inOut(a,b) freopen(a,"r",stdin);freopen(b,"w",stdout);
# define RESET(a) memset(a,0,sizeof(a))
# define MEMO(a) memset(a,-1,sizeof(a))
# define DEBUG puts("Debug-Has-Come-Until-Here")


typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;

int main(){
	cin.tie(NULL);

	int a,b,hitung;
	while(scanf("%d %d", &a,&b) != EOF){
		hitung = 0;
		a = a+b;
		if (a == 0)hitung = 1;
		while(a >0){
			hitung ++;
			a/=10;
		}
		printf("%d\n", hitung);
	}
	return 0;
}