public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringBuilder sb = new StringBuilder ( ) ;
  char [ ] a = br . readLine ( ) . toCharArray ( ) ;
  char [ ] b = br . readLine ( ) . toCharArray ( ) ;
  int lenA = a . length , lenB = b . length ;
  int [ ] pref_1 = new int [ lenB + 1 ] ;
  int [ ] pref_0 = new int [ lenB + 1 ] ;
  pref_1 [ 0 ] = 0 ;
  pref_0 [ 0 ] = 0 ;
  for ( int i = 0 ;
  i < lenB ;
  i ++ ) {
    pref_1 [ i + 1 ] = pref_1 [ i ] + ( ( b [ i ] == '1' ) ? 1 : 0 ) ;
    pref_0 [ i + 1 ] = pref_0 [ i ] + ( ( b [ i ] == '0' ) ? 1 : 0 ) ;
  }
  long ans = 0 ;
  for ( int i = 0 ;
  i < lenA ;
  i ++ ) {
    if ( a [ i ] == '0' ) {
      ans += pref_1 [ lenB - lenA + 1 + i ] - pref_1 [ i ] ;
    }
    else {
      ans += pref_0 [ lenB - lenA + 1 + i ] - pref_0 [ i ] ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringBuilder sb = new StringBuilder ( ) ; char [ ] a = br . readLine ( ) . toCharArray ( ) ; char [ ] b = br . readLine ( ) . toCharArray ( ) ; int lenA = a . length , lenB = b . length ; int [ ] pref_1 = new int [ lenB + 1 ] ; int [ ] pref_0 = new int [ lenB + 1 ] ; pref_1 [ 0 ] = 0 ; pref_0 [ 0 ] = 0 ; for ( int i = 0 ; i < lenB ; i ++ ) { pref_1 [ i + 1 ] = pref_1 [ i ] + ( ( b [ i ] == '1' ) ? 1 : 0 ) ; pref_0 [ i + 1 ] = pref_0 [ i ] + ( ( b [ i ] == '0' ) ? 1 : 0 ) ; } long ans = 0 ; for ( int i = 0 ; i < lenA ; i ++ ) { if ( a [ i ] == '0' ) { ans += pref_1 [ lenB - lenA + 1 + i ] - pref_1 [ i ] ; } else { ans += pref_0 [ lenB - lenA + 1 + i ] - pref_0 [ i ] ; } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier))) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (parenthesized_expression (ternary_expression condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (decimal_integer_literal) alternative: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (parenthesized_expression (ternary_expression condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (decimal_integer_literal) alternative: (decimal_integer_literal)))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)) right: (identifier))) right: (array_access array: (identifier) index: (identifier)))))) 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