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

class Main{
    public static void main(String[] a) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str;
		int sum=0;
		while((str=br.readLine()) != null) {
			if(!str.isEmpty()) {
				StringTokenizer tkn = new StringTokenizer(str, " ");
				sum = Integer.parseInt(tkn.nextToken())+Integer.parseInt(tkn.nextToken());
				System.out.println((String.valueOf(sum)).length());
			}
		}
    }
}
/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