#include <iostream>
#include <cstdio>
using namespace std;
int main(){
  int a, b;

  while(scanf("%d %d", &a, &b ) != EOF){
    int c = a + b;
    int n = 1;
    while(1){ 
      c /= 10;   
      if(c  == 0) break;
      n++;
    }
    cout << n << endl;
  }

  return 0;
}