import java.util.*;


public class Main {
    public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        String[] S = sc.nextLine().split("");
        String[] T = sc.nextLine().split("");
        
        int count = 0; 
        
        for (int i = 0; i < 3; i++) {
            
            if (Arrays.asList(S[i]).contains(T[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