#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> P;
#define FOR(I,A,B) for(int I=int(A);I<int(B);++I)

int main(){
	int a,b; 
	auto f = [](int x,int y){
		int ans=0,k=x+y;
		while(k){
			ans++;
			k /= 10;
		}
		return ans;
	};
	while(scanf("%d %d",&a,&b)!=EOF){
		cout << f(a,b) << endl;
	}
}
