#include<iostream>
#include<cstdio>
int main()
{
	using namespace std;
	int a,b,c;
	while(scanf("%d%d",&a,&b)!=EOF)
	{
		c=a+b;
		int ans=1;
		while(c/10!=0)
		{
			++ans;
			c/=10;
		}
		cout<<ans<<endl;
	}
	return 0;
}
