/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		
		int i = 0;
		int arr[];
		while( sc.hasNext() ){
			arr = new int[2];
			
    		String line[] = sc.nextLine().split(" ");
			arr[0] = Integer.parseInt(line[0]);
			arr[1] = Integer.parseInt(line[1]);
			
    		System.out.println(String.valueOf(arr[0]+arr[1]).length());
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz