#include <iostream>
#include <cmath>
int main()
{
  int a, b;
  while (std::cin >> a >> b) {
    for (int i = 1; i < 7; i++) {
      if (a + b < pow(10, i)) {
        std::cout << i << std::endl;
        break;
      }
    }
  }
  return 0;
}