// Arup Guha
// 3/5/2022
// Solution to 2021 SER D2 Problem: Double Password

import java.util.*;

public class password {
	
	public static void main(String[] args) {

		// Read two strings.
		Scanner stdin = new Scanner(System.in);
		char[] s1 = stdin.next().toCharArray();
		char[] s2 = stdin.next().toCharArray();
		
		// Just multiply answer by 2 if two characters are different.
		int res = 1;
		for (int i=0; i<s1.length; i++)
			if (s1[i] != s2[i])
				res *= 2;
		System.out.println(res);
	}
}