import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S1 = sc.nextLine();
		char[] a = S1.toCharArray();
		String S2 = sc.nextLine();
		char[] b = S2.toCharArray();
		int number = 0;
		if(a[0]==b[0]) {
			number++;
		}
		if(a[1]==b[1]) {
			number++;
		}
		if(a[2]==b[2]) {
			number++;
		}
		System.out.println(number);
	}
}
/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