public static void main ( String [ ] args ) {
  RealScanner sc = new RealScanner ( ) ;
  String s = sc . next ( ) ;
  boolean check = true ;
  char ch ;
  for ( int i = 1 ;
  i < s . length ( ) ;
  i ++ ) {
    if ( Character . isLowerCase ( s . charAt ( i ) ) ) {
      check = false ;
    }
  }
  if ( check ) {
    for ( int j = 0 ;
    j < s . length ( ) ;
    j ++ ) {
      if ( Character . isLowerCase ( s . charAt ( j ) ) ) {
        ch = Character . toUpperCase ( s . charAt ( j ) ) ;
      }
      else {
        ch = Character . toLowerCase ( s . charAt ( j ) ) ;
      }
      System . out . print ( ch ) ;
    }
  }
  else {
    System . out . print ( s ) ;
  }
}

public static void main ( String [ ] args ) { RealScanner sc = new RealScanner ( ) ; String s = sc . next ( ) ; boolean check = true ; char ch ; for ( int i = 1 ; i < s . length ( ) ; i ++ ) { if ( Character . isLowerCase ( s . charAt ( i ) ) ) { check = false ; } } if ( check ) { for ( int j = 0 ; j < s . length ( ) ; j ++ ) { if ( Character . isLowerCase ( s . charAt ( j ) ) ) { ch = Character . toUpperCase ( s . charAt ( j ) ) ; } else { ch = Character . toLowerCase ( s . charAt ( j ) ) ; } System . out . print ( ch ) ; } } else { System . out . print ( s ) ; } }
(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)))) (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: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier))) (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (false))))))) (if_statement condition: (parenthesized_expression (identifier)) consequence: (block (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (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 (identifier))))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))