#include <stdio.h>

int main(void){
	int a,b;
	int sum;
	int loop_i,loop_j;
	int cnt=0;

	while(1){
		sum = 0;
		fscanf(stdin,"%d %d",&a,&b);
		sum = a+b;
		do{
			sum = sum/10;
			cnt++;
			if(sum == 0)
				break;
		}while(1);
		printf("%d\n",cnt);
	}
	return 0;
}