#include<iostream>
#include<vector>
#include<algorithm>
#include<string>

#define REP(i,n) for(int i=0;i<(int)n;++i)

using namespace std;

void solver() {
    int a,b;
    while(cin>>a>>b){
        cout<<to_string(a+b).length()<<endl;
    }
}

int main() {
    solver();
    return 0;
}