public static void main ( String [ ] args ) throws Exception {
  Scanner sc = new Scanner ( System . in ) ;
  String s = sc . next ( ) ;
  String t = sc . next ( ) ;
  sc . close ( ) ;
  Map < Character , Integer > mapS = new HashMap < Character , Integer > ( ) ;
  Map < Character , Integer > mapT = new HashMap < Character , Integer > ( ) ;
  int cnt = 0 ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    char charS = s . charAt ( i ) ;
    char charT = t . charAt ( i ) ;
    if ( mapS . containsKey ( charS ) ) {
      if ( mapT . containsKey ( charT ) ) {
        if ( ! mapS . get ( charS ) . equals ( mapT . get ( charT ) ) ) {
          System . out . println ( "No" ) ;
          return ;
        }
      }
      else {
        System . out . println ( "No" ) ;
        return ;
      }
    }
    else {
      if ( mapT . containsKey ( charT ) ) {
        System . out . println ( "No" ) ;
        return ;
      }
      cnt ++ ;
      mapS . put ( charS , cnt ) ;
      mapT . put ( charT , cnt ) ;
    }
  }
  System . out . println ( "Yes" ) ;
}

public static void main ( String [ ] args ) throws Exception { Scanner sc = new Scanner ( System . in ) ; String s = sc . next ( ) ; String t = sc . next ( ) ; sc . close ( ) ; Map < Character , Integer > mapS = new HashMap < Character , Integer > ( ) ; Map < Character , Integer > mapT = new HashMap < Character , Integer > ( ) ; int cnt = 0 ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { char charS = s . charAt ( i ) ; char charT = t . charAt ( i ) ; if ( mapS . containsKey ( charS ) ) { if ( mapT . containsKey ( charT ) ) { if ( ! mapS . get ( charS ) . equals ( mapT . get ( charT ) ) ) { System . out . println ( " No " ) ; return ; } } else { System . out . println ( " No " ) ; return ; } } else { if ( mapT . containsKey ( charT ) ) { System . out . println ( " No " ) ; return ; } cnt ++ ; mapS . put ( charS , cnt ) ; mapT . put ( charT , cnt ) ; } } System . out . println ( " Yes " ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) arguments: (argument_list)))) (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: (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))))) (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (if_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement)))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement)))) alternative: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))) (expression_statement (update_expression (identifier))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier)))) (expression_statement (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 (string_literal))))))