#include <cstdio>
using namespace std;
int toLowUnder10(int arg) {
	return (10 > arg) ? arg : (toLowUnder10(arg/10) + 1) ;
}

int main (int argc, char *argv[]) {
	int a,b;
	while (EOF != fscanf(stdin, "%d %d", &a, &b)) {
		printf("%d\n", toLowUnder10(a+b));
	}
	return 0;
}