import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner scanner = new Scanner(System.in);

		//入力表示
		String S = scanner.next();
		String T = scanner.next();
		 int count=0;
		
		if (S.charAt(0)==T.charAt(0)) {
			count++;
		}
		if (S.charAt(1)==T.charAt(1)) {
			count++;
		}
		if (S.charAt(2)==T.charAt(2)) {
			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