#include <stdio.h>
 
int main()
{
	int a,b;
 
	while(1)
	{
		int kai;
		int i = 1;
		int j = scanf("%d %d" , &a,&b);
		if(j==EOF) break;
 
		kai = a+b;
 
		while(kai > 9)
		{
			kai /= 10;
			i++;
		}
 
		printf("%d\n" , i);
	}
return 0;
}