#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 << endl;
??
????}
????return 0;
}