
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String T = sc.next();
		String[] Slist = S.split("");
		String[] Tlist = T.split("");
		int countNum = 0;

		for(int i = 0; i <= 2 ; i++) {
			if(Slist[i].equals(Tlist[i])) {
				countNum++;
			}
		}

		System.out.println(countNum);
	}
}
/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