import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String a = sc.nextLine();
        String b = sc.nextLine();
        int cnt = 0;

        if(a.charAt(0)==b.charAt(0)){
            cnt++;
        }
        if(a.charAt(1)==b.charAt(1)){
            cnt++;
        }
        if(a.charAt(2)==b.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