import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

class Main {
    public static void main(String[] args) throws IOException {
	    	Scanner in = new Scanner(System.in);
	    	
	    	while(in.hasNextInt()) {
	    		int a = in.nextInt();
	    		int b = in.nextInt();
	    		a += b;
	    		int numDigit = String.valueOf(a).length();
	    		System.out.println(numDigit);
	    	}
    }
}
/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