import java.io.*;
import java.util.*;
public class Main {

	public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	}
} import java.io.*; io.* java import java.util.*; util.* java public class Main {

	public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	}
} Main public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	} main {

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	} Scanner sc=new Scanner(System.in); sc new Scanner(System.in) while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		} sc.hasNext() sc.hasNext sc {
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		} String[] line=sc.nextLine().split(" "); line sc.nextLine().split(" ") sc.nextLine().split sc.nextLine() sc.nextLine sc " " int a=Integer.parseInt(line[0]); a Integer.parseInt(line[0]) Integer.parseInt Integer line[0] line 0 int b=Integer.parseInt(line[1]); b Integer.parseInt(line[1]) Integer.parseInt Integer line[1] line 1 int sum=a+b; sum a+b a b System.out.println(String.valueOf(sum).length()) System.out.println System.out System System.out String.valueOf(sum).length() String.valueOf(sum).length String.valueOf(sum) String.valueOf String sum String []args args public class Main {

	public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	}
} public class Main {

	public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	}
} Main
import java.io.*;
import java.util.*;
public class Main {

	public static void main(String []args){

		Scanner sc=new Scanner(System.in);

		while(sc.hasNext()){
			String[] line=sc.nextLine().split(" ");

			int a=Integer.parseInt(line[0]);
			int b=Integer.parseInt(line[1]);

			int sum=a+b;

			System.out.println(String.valueOf(sum).length());
		}

	}
}