public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String X = sc . next ( ) ;
  Deque < Character > stack = new ArrayDeque < > ( ) ;
  for ( int i = 0 ;
  i < X . length ( ) ;
  i ++ ) {
    if ( X . charAt ( i ) == 'S' ) {
      stack . push ( X . charAt ( i ) ) ;
    }
    else {
      if ( stack . size ( ) == 0 ) {
        stack . push ( X . charAt ( i ) ) ;
      }
      else if ( stack . peek ( ) == 'S' ) {
        stack . pop ( ) ;
      }
      else if ( stack . peek ( ) == 'T' ) {
        stack . push ( X . charAt ( i ) ) ;
      }
    }
  }
  System . out . println ( stack . size ( ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String X = sc . next ( ) ; Deque < Character > stack = new ArrayDeque < > ( ) ; for ( int i = 0 ; i < X . length ( ) ; i ++ ) { if ( X . charAt ( i ) == ' S ' ) { stack . push ( X . charAt ( i ) ) ; } else { if ( stack . size ( ) == 0 ) { stack . push ( X . charAt ( i ) ) ; } else if ( stack . peek ( ) == ' S ' ) { stack . pop ( ) ; } else if ( stack . peek ( ) == ' T ' ) { stack . push ( X . charAt ( i ) ) ; } } } System . out . println ( stack . 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: (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: (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 (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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: (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 (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)))))))