public static void main ( String [ ] args ) throws IOException {
  MyScanner sc = new MyScanner ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int N = sc . nextInt ( ) ;
  char [ ] vals = sc . next ( ) . toCharArray ( ) ;
  long [ ] cant = new long [ 26 ] ;
  for ( int i = 0 ;
  i < vals . length ;
  i ++ ) {
    cant [ vals [ i ] - 'a' ] ++ ;
  }
  long ans = 1 ;
  for ( int i = 0 ;
  i < cant . length ;
  i ++ ) {
    ans *= 1 + cant [ i ] ;
    ans %= MOD ;
  }
  ans += MOD - 1 ;
  ans %= MOD ;
  out . println ( ans ) ;
  out . flush ( ) ;
}

public static void main ( String [ ] args ) throws IOException { MyScanner sc = new MyScanner ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int N = sc . nextInt ( ) ; char [ ] vals = sc . next ( ) . toCharArray ( ) ; long [ ] cant = new long [ 26 ] ; for ( int i = 0 ; i < vals . length ; i ++ ) { cant [ vals [ i ] - ' a ' ] ++ ; } long ans = 1 ; for ( int i = 0 ; i < cant . length ; i ++ ) { ans *= 1 + cant [ i ] ; ans %= MOD ; } ans += MOD - 1 ; ans %= MOD ; out . println ( ans ) ; out . flush ( ) ; }
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