#include<iostream> 
#include<cstdio>
using namespace std; 
int main() 
{ int a,b; while(scanf("%d%d",&a,&b)!=EOF) 
{ int x=a+b; int cnt=0; 
while(x) { cnt++; x/=10; } 
cout <<cnt<<endl;
} 
return 0; 
}