source_code: import java.util.*;
   
  public class Main {
    public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
  	 int[][] x = new int [200010][10];
       String a = sc.nextLine(); 
       String b = sc.nextLine(); 
   	  int n = a.length();
  	  int m = b.length();
         for (int i = 1; i <= m; i++) {
           for (int j = 0; j < 2; j++) {
             x[i][j] = x[i - 1][j];
           }
           ++x[i][b.charAt(i - 1) - '0'];
         }
         long res = 0;
          for (int i = 0, c; i < n; i++) {
            c = a.charAt(i) - '0';
             for (int j = 0; j < 2; j++) {
               res += Math.abs(c - j) * (x[m - n + i + 1][j] - x[i][j]);
             }
          }
           System.out.println(res);
    }
  }