import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String S = s.nextLine();
		String T = s.nextLine();
		int count = 0;

		if (S.charAt(0) == T.charAt(0)) {
			count += 1;
		}
		if (S.charAt(1) == T.charAt(1)) {
			count += 1;
		}
		if (S.charAt(2) == T.charAt(2)) {
			count += 1;
		}
		System.out.println(count);
	}
}
/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