import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

	Scanner sc = new Scanner(System.in);

	String N = sc.next();
	String T = sc.next();
	int cnt = 0;

	if(N.charAt(0)==T.charAt(0)) {
		cnt++;
	}
	if(N.charAt(1)==T.charAt(1)) {
		cnt++;
	}
	if(N.charAt(2)==T.charAt(2)) {
		cnt++;
	}
	System.out.println(cnt);

	}
}

/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