#include <iostream>
using namespace std;

int main()
{
  int a, b;
  while (cin >> a >> b) {
    int c = a + b;
    int i;
    for (i = 1; c > 0; i++) {
      c /= 10;
    }
    cout << i - 1 << endl;
  }
  return 0;
}