include<bits/stdc++.h>

using namespace std; int main(){

int a,b,c= 0,d = 0;
cin>>a>>b;
while(a!=0||b!=0)
{
	if (a%10+b%10+d>=10)
	{
		c++;
		d=1;
	}
	else
	{
		d = 0;
	}
	a= a/10;
	b = b/10;
}
cout<<c;
return 0;

}