import java.util.*;
public class Main {
	public static void main(String[] args){
      Scanner sc = new Scanner(System.in);
	  String[] forecast = sc.nextLine().split("");
      String[] ans = sc.nextLine().split("");
      int count = 0;
	  for (int i = 0; i < 3; i++) {
        if (forecast[i].equals(ans[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