#include<cstdio>
using namespace std;
int main()
{
   int n,m,ans,sum;
   while(scanf("%d%d",&n,&m)!=EOF)
   {
       ans=0,sum=n+m;
       while(sum)
       {
           ans++;
           sum/=10;
       }
       //if(!ans)ans++;
       printf("%d\n",ans);
   }
}