import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main (String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        StringBuilder sb = new StringBuilder("");
        int a, b, digit;
        while (sc.hasNextInt()) {
            a = sc.nextInt();
            b = sc.nextInt();
            digit = (int) Math.log10(a+b) + 1;
            sb.append(digit);
            sb.append('\n');
        }
        System.out.print(sb);
    }
}
/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