import java.util.*;
class Main {
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		String T = sc.next();
		String[] SArray = S.split("");
		String[] TArray = T.split("");
		int x=0;
		if(SArray[0].equals(TArray[0])){x=x+1;};
		if(SArray[1].equals(TArray[1])){x=x+1;};
		if(SArray[2].equals(TArray[2])){x=x+1;};
		System.out.println(x);
	}
}
/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