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

public class Main {

	/**
	 * AOJ002 Digit Number
	 *
	 * @param args
	 * @throws IOException
	 *             ??\?????¨??????
	 */
	public static void main(String[] args) throws IOException {

		BufferedReader bufferedReader = new BufferedReader(
				new InputStreamReader(System.in));

		String strInput = bufferedReader.readLine();
		while (strInput != null) {
			String[] strDigit = strInput.split("\\s");

			int sum = Integer.parseInt(strDigit[0])
					+ Integer.parseInt(strDigit[1]);

			System.out.println(Integer.toString(sum).length());
			strInput = bufferedReader.readLine();
		}

		bufferedReader.close();
	}

}
/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