public static void main ( String args [ ] ) {
  Scanner s = new Scanner ( System . in ) ;
  String str = s . next ( ) ;
  long prefix [ ] = new long [ str . length ( ) ] ;
  long suffix [ ] = new long [ str . length ( ) ] ;
  for ( int i = 1 ;
  i < str . length ( ) ;
  i ++ ) {
    prefix [ i ] = prefix [ i - 1 ] ;
    if ( str . charAt ( i ) == 'v' && str . charAt ( i - 1 ) == 'v' ) {
      prefix [ i ] ++ ;
    }
  }
  for ( int i = str . length ( ) - 2 ;
  i >= 0 ;
  i -- ) {
    suffix [ i ] = suffix [ i + 1 ] ;
    if ( str . charAt ( i ) == 'v' && str . charAt ( i + 1 ) == 'v' ) {
      suffix [ i ] ++ ;
    }
  }
  long ans = 0 ;
  for ( int i = 0 ;
  i < str . length ( ) ;
  i ++ ) {
    if ( str . charAt ( i ) == 'o' ) {
      ans += prefix [ i ] * suffix [ i ] ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String args [ ] ) { Scanner s = new Scanner ( System . in ) ; String str = s . next ( ) ; long prefix [ ] = new long [ str . length ( ) ] ; long suffix [ ] = new long [ str . length ( ) ] ; for ( int i = 1 ; i < str . length ( ) ; i ++ ) { prefix [ i ] = prefix [ i - 1 ] ; if ( str . charAt ( i ) == ' v ' && str . charAt ( i - 1 ) == ' v ' ) { prefix [ i ] ++ ; } } for ( int i = str . length ( ) - 2 ; i >= 0 ; i -- ) { suffix [ i ] = suffix [ i + 1 ] ; if ( str . charAt ( i ) == ' v ' && str . charAt ( i + 1 ) == ' v ' ) { suffix [ i ] ++ ; } } long ans = 0 ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { if ( str . charAt ( i ) == ' o ' ) { ans += prefix [ i ] * suffix [ i ] ; } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (character_literal)))) consequence: (block (expression_statement (update_expression (array_access array: (identifier) index: (identifier)))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (character_literal)))) consequence: (block (expression_statement (update_expression (array_access array: (identifier) index: (identifier)))))))) (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))