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

public class Main {

	public static void main(String[] args) throws IOException {
		//?????°?¨????
		String line, output;
		int num1, num2;

		//????????????
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while ((line =br.readLine()) != null) {
			//??????
			String[] numString = line.split(" ", 0);
			//??????
			num1 = Integer.parseInt(numString[0]);
			num2 = Integer.parseInt(numString[1]);
			//?¨????
			num1 = num1 + num2;
			//??????
			output = String.valueOf(num1);
			System.out.println(output.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