import java.util.*;

public class Main {
	  public static void main(String args[]){
      	Scanner scan = new Scanner(System.in);
            
        String S = scan.next();
        String T = scan.next();
        int cnt = 0;
        
        for( int i = 0 ; i < 3 ; i++){
          if( S.substring(i,i+1).charAt(0) ==T.substring(i,i+1).charAt(0) )
            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