static int countWays ( String s ) {
  int count [ ] = new int [ 26 ] ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) count [ s . charAt ( i ) - 'a' ] ++ ;
  count [ s . charAt ( 0 ) - 'a' ] = 1 ;
  int ans = 1 ;
  for ( int i = 0 ;
  i < 26 ;
  ++ i ) if ( count [ i ] != 0 ) ans *= count [ i ] ;
  return ans ;
}

static int countWays ( String s ) { int count [ ] = new int [ 26 ] ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) count [ s . charAt ( i ) - ' a ' ] ++ ; count [ s . charAt ( 0 ) - ' a ' ] = 1 ; int ans = 1 ; for ( int i = 0 ; i < 26 ; ++ i ) if ( count [ i ] != 0 ) ans *= count [ i ] ; return ans ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (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: (expression_statement (update_expression (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal))) right: (character_literal))) right: (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: (decimal_integer_literal)) update: (update_expression (identifier)) body: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) (return_statement (identifier))))