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

public class Main {

	public static void main(String[] args) throws IOException {
		// TODO ?????????????????????????????????????????????
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		while(true){
			String tmpStr = br.readLine();
			if(tmpStr == null){
				break;
			}

			String[] tmpArray = tmpStr.split(" ");
			//int num1;

			int num1 = Integer.parseInt(tmpArray[0]);
			int num2 = Integer.parseInt(tmpArray[1]);

			int sum = num1 + num2;

			int keta = 0;
			for (keta = 0; sum > 0 ; keta++ ){
				sum /= 10;
			}
			System.out.println(keta);
		}


	}

}
/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