#include <stdio.h>
#include <stdlib.h>
int main()
{
    long a,b;
	while(scanf("%ld%ld",&a,&b)!=EOF){
		long sum=a+b;
		int count=0;
		while(sum>0){
			sum=sum/10;
			count++;
		}
		printf("%d\n",count);
	}
	return 0;
}