import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws IOException{
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String str;
		int a,b;
		while((str=in.readLine())!=null){
			a=getA(str);
			b=getB(str);
			System.out.println(countDigit(a+b));
		}
		
	}
	
	public static int getA(String str){
		int index,num;
		index = str.indexOf(" ");
		num=Integer.parseInt(str.substring(0,index));
		return num;
	}
	
	public static int getB(String str){
		int index,num;
		index = str.indexOf(" ");
		num=Integer.parseInt(str.substring(index+1));
		return num;
	}
	
	public static int countDigit(int num){
		int dig=1;
		while(num>=10){
			num=num/10;
			dig++;
		}		
		return dig;
	}

}
/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