public static void main ( String [ ] args ) {
  String s = sc . next ( ) ;
  ArrayDeque < Character > dq = new ArrayDeque < > ( ) ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    char c = s . charAt ( i ) ;
    if ( c == 'T' ) {
      if ( dq . peekFirst ( ) == null || dq . peekFirst ( ) == 'T' ) {
        dq . addFirst ( c ) ;
      }
      else if ( dq . peekFirst ( ) == 'S' ) {
        dq . removeFirst ( ) ;
      }
    }
    else if ( c == 'S' ) {
      dq . addFirst ( c ) ;
    }
  }
  System . out . println ( dq . size ( ) ) ;
}

public static void main ( String [ ] args ) { String s = sc . next ( ) ; ArrayDeque < Character > dq = new ArrayDeque < > ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { char c = s . charAt ( i ) ; if ( c == ' T ' ) { if ( dq . peekFirst ( ) == null || dq . peekFirst ( ) == ' T ' ) { dq . addFirst ( c ) ; } else if ( dq . peekFirst ( ) == ' S ' ) { dq . removeFirst ( ) ; } } else if ( c == ' S ' ) { dq . addFirst ( c ) ; } } System . out . println ( dq . size ( ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (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: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) 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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (character_literal))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (null_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (character_literal)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (character_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (character_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))