import java.util.Scanner;

class Main {
    public static void main (String args[]) {
	Scanner scan = new Scanner(System.in);
	int sum = 0;

	while (scan.hasNext()) {
	    sum = scan.nextInt() + scan.nextInt();
	    System.out.println((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