#include<iostream>
#include<algorithm>
#include<cmath>

using namespace std;

int main() {
  for (int i = 0; i < 200; i++) {
    int a;
    int b;
    cin >> a >> b;
    if (a + b == 0) {
      printf("%d\n", 1);
    }else{
      printf("%d\n",1+((int)floor(log10(a + b))));
    }
  }
  return 0;
}