#include <stdio.h>
int main(){
	int a = 0,b = 0;
	int c = 0;
	int count = 1;
	while(scanf("%d %d",&a,&b) != EOF){
		c = a + b;
		while(1){
			if(c / 10 < 10){
				count++;
				break;
			}
			else{
				c /= 10;
				count++;
			}
		}
		printf("%d\n",count);
		count = 1;
	}
	return 0;
}