public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  char [ ] first = s . nextLine ( ) . toCharArray ( ) ;
  char [ ] second = s . nextLine ( ) . toCharArray ( ) ;
  boolean match = true ;
  if ( first . length != second . length ) {
    match = false ;
  }
  else {
    int diff = 0 ;
    for ( int i = 0 ;
    i < first . length ;
    i ++ ) {
      if ( first [ i ] != second [ i ] ) {
        diff ++ ;
      }
    }
    if ( diff != 2 ) {
      match = false ;
    }
    else {
      Arrays . sort ( first ) ;
      Arrays . sort ( second ) ;
      match = Arrays . equals ( first , second ) ;
    }
  }
  System . out . println ( match == true ? "YES" : "NO" ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; char [ ] first = s . nextLine ( ) . toCharArray ( ) ; char [ ] second = s . nextLine ( ) . toCharArray ( ) ; boolean match = true ; if ( first . length != second . length ) { match = false ; } else { int diff = 0 ; for ( int i = 0 ; i < first . length ; i ++ ) { if ( first [ i ] != second [ i ] ) { diff ++ ; } } if ( diff != 2 ) { match = false ; } else { Arrays . sort ( first ) ; Arrays . sort ( second ) ; match = Arrays . equals ( first , second ) ; } } System . out . println ( match == true ? " YES " : " NO " ) ; }
(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: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true))) (if_statement condition: (parenthesized_expression (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (field_access object: (identifier) field: (identifier)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (false)))) alternative: (block (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: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (update_expression (identifier))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (false)))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (ternary_expression condition: (binary_expression left: (identifier) right: (true)) consequence: (string_literal) alternative: (string_literal)))))))