public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  long arr [ ] = new long [ n ] ;
  long arr2 [ ] = new long [ n ] ;
  long sum = 0 ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    arr [ i ] = input . nextInt ( ) ;
    sum += arr [ i ] ;
  }
  for ( int j = 0 ;
  j < n ;
  j ++ ) {
    if ( ( sum - arr [ j ] ) == ( arr [ j ] * ( n - 1 ) ) ) {
      arr2 [ count ] = j ;
      count ++ ;
    }
  }
  System . out . println ( count ) ;
  if ( count != 0 ) {
    for ( int k = 0 ;
    k < count ;
    k ++ ) {
      System . out . print ( arr2 [ k ] + 1 + " " ) ;
    }
  }
  input . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; long arr [ ] = new long [ n ] ; long arr2 [ ] = new long [ n ] ; long sum = 0 ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = input . nextInt ( ) ; sum += arr [ i ] ; } for ( int j = 0 ; j < n ; j ++ ) { if ( ( sum - arr [ j ] ) == ( arr [ j ] * ( n - 1 ) ) ) { arr2 [ count ] = j ; count ++ ; } } System . out . println ( count ) ; if ( count != 0 ) { for ( int k = 0 ; k < count ; k ++ ) { System . out . print ( arr2 [ k ] + 1 + " ▁ " ) ; } } input . close ( ) ; }
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