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();
      int count =0;
      
    if(S.substring(0,1).equals(T.substring(0,1))){
        count++;   
      }
    if(S.substring(1,2).equals(T.substring(1,2))){
      count++;
      }
    if(S.substring(2,3).equals(T.substring(2,3))){
      count++;
    }
     System.out.print(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