#include <stdio.h>
int ketasu(int atai){
	int result = 0;
	for(atai != 0){
		result++;
		atai = atai / 10;
	}
	return result;
}
int main(){
	int a, b;
	while(scanf("%d %d",&a, &b) != -1) printf("%d\n", ketasu(a + b));
	return 0;
}