#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>

template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str(); }
using namespace std;
int main()
{
	int a, b;
	while (cin>>a>>b)
	{
		cout << to_string(a+b).length() << endl;
	}
	return 0;

}