#include <bits/stdc++.h>
using namespace std;

#define REP(i, s, n) for(int i = s; i < n; ++i)
#define rep(i, n)		 REP(i, 0, n)
#define SORT(c)			 sort((c).begin(), (c).end())
#define IINF					INT_MAX
#define LLINF					LLONG_MAX
#define DEBUG					false

int main(){
    int a,b;
    int temp=0;
    int ans=1;
    while(cin>>a>>b){
        temp=a+b;
        ans=1;
        while(10<=temp){
            temp=temp/10;
            ans++;
        }
        cout<<ans<<endl;
    }     
}