
import java.util.Scanner;

public class Main {

   
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.nextLine();
        String t = scanner.nextLine();
        scanner.close();
        int count = 0;
        for(int i = 0 ; i <s.length();i++){
        if(s.charAt(i) == t.charAt(i)){
        count++;
        }
        }
                     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