public static void main ( String [ ] $ ) {
  Scanner sc = new Scanner ( in ) ;
  String s = sc . next ( ) ;
  int l = 0 , r = 1 ;
  int n = s . length ( ) ;
  int ans = 0 ;
  while ( r < n && l < n - 1 ) {
    if ( l == r ) r ++ ;
    if ( s . charAt ( l ) == 'S' ) {
      if ( s . charAt ( r ) == 'T' ) {
        ans ++ ;
        r ++ ;
        l ++ ;
      }
      else {
        r ++ ;
      }
    }
    else {
      l ++ ;
    }
  }
  out . println ( n - ans * 2 ) ;
}

public static void main ( String [ ] $ ) { Scanner sc = new Scanner ( in ) ; String s = sc . next ( ) ; int l = 0 , r = 1 ; int n = s . length ( ) ; int ans = 0 ; while ( r < n && l < n - 1 ) { if ( l == r ) r ++ ; if ( s . charAt ( l ) == ' S ' ) { if ( s . charAt ( r ) == ' T ' ) { ans ++ ; r ++ ; l ++ ; } else { r ++ ; } } else { l ++ ; } } out . println ( n - ans * 2 ) ; }
(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 (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) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) 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) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (update_expression (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (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 (update_expression (identifier))) (expression_statement (update_expression (identifier))) (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (update_expression (identifier)))))) alternative: (block (expression_statement (update_expression (identifier))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))))