public static void main ( String [ ] args ) {
  Scanner cin = new Scanner ( System . in ) ;
  ArrayList < Integer > list = new ArrayList < > ( ) ;
  int input = cin . nextInt ( ) ;
  int [ ] arr = new int [ 10000000 ] ;
  int counter = 0 ;
  for ( int i = 0 ;
  i < input ;
  i ++ ) {
    int r = cin . nextInt ( ) ;
    for ( int j = 0 ;
    j < r ;
    j ++ ) {
      int temp = cin . nextInt ( ) ;
      arr [ counter ] = temp ;
      counter ++ ;
    }
  }
  for ( int i = 0 ;
  i < counter ;
  i ++ ) {
    int count = 0 ;
    for ( int j = i ;
    j < counter ;
    j ++ ) {
      if ( arr [ i ] == arr [ j ] ) {
        count ++ ;
      }
    }
    if ( count == input ) list . add ( arr [ i ] ) ;
  }
  for ( int x : list ) {
    System . out . print ( x + " " ) ;
  }
  System . out . println ( ) ;
}

public static void main ( String [ ] args ) { Scanner cin = new Scanner ( System . in ) ; ArrayList < Integer > list = new ArrayList < > ( ) ; int input = cin . nextInt ( ) ; int [ ] arr = new int [ 10000000 ] ; int counter = 0 ; for ( int i = 0 ; i < input ; i ++ ) { int r = cin . nextInt ( ) ; for ( int j = 0 ; j < r ; j ++ ) { int temp = cin . nextInt ( ) ; arr [ counter ] = temp ; counter ++ ; } } for ( int i = 0 ; i < counter ; i ++ ) { int count = 0 ; for ( int j = i ; j < counter ; j ++ ) { if ( arr [ i ] == arr [ j ] ) { count ++ ; } } if ( count == input ) list . add ( arr [ i ] ) ; } for ( int x : list ) { System . out . print ( x + " ▁ " ) ; } System . out . println ( ) ; }
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