import java.util.*;

public class Main {
    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    }
} Main public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    } main {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    } Scanner s = new Scanner(System.in); s new Scanner(System.in) while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	} s.hasNext() s.hasNext s {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	} int sum = s.nextInt() + s.nextInt(); sum s.nextInt() + s.nextInt() s.nextInt() s.nextInt s s.nextInt() s.nextInt s 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 s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    }
} public class Main {
    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
	Scanner s = new Scanner(System.in);
	while(s.hasNext()) {
	    int sum = s.nextInt() + s.nextInt();
	    System.out.println(String.valueOf(sum).length());
	}
    }
}