#include<iostream>
#include<string>
int main() {
	int data1,data2,i;
	char a[100];
	while (1) {
		std::cin >> data1 >> data2;
		if (data1==EOF) break;
		data1 += data2;
		std::string aa = std::to_string(data1);
		for (i = 0; aa[i] != '\0'; i++) {

		}
		std::cout << i << std::endl;
	}
	return 0;
}