import java.util.Scanner;

class Main {
	public static int a, b;
	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		while(cin.hasNextInt()){
			a = cin.nextInt();
			b = cin.nextInt();
			solve();
		}
	}
	
	public static void solve() {
		a += b;
		int ans = 1;
		while(a / 10 > 0){
			a /= 10;
			ans++;
		}
		System.out.println(ans);
	}
}
/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