public static void main ( String [ ] args ) throws IOException {
  FastReader sc = new FastReader ( ) ;
  PrintWriter p = new PrintWriter ( System . out ) ;
  int n = sc . nextInt ( ) ;
  int arr [ ] = new int [ 101 ] ;
  boolean flag = false ;
  while ( n -- > 0 ) {
    int x = sc . nextInt ( ) ;
    for ( int i = 0 ;
    i < x ;
    i ++ ) {
      arr [ sc . nextInt ( ) ] ++ ;
    }
  }
  ArrayList < Integer > ans = new ArrayList < > ( ) ;
  int max = - 1 ;
  for ( int i = 0 ;
  i < 101 ;
  i ++ ) {
    max = Math . max ( max , arr [ i ] ) ;
  }
  for ( int i = 0 ;
  i < 101 ;
  i ++ ) {
    if ( arr [ i ] == max ) {
      ans . add ( i ) ;
    }
  }
  for ( int i : ans ) {
    System . out . print ( i + " " ) ;
  }
  System . out . println ( ) ;
}

public static void main ( String [ ] args ) throws IOException { FastReader sc = new FastReader ( ) ; PrintWriter p = new PrintWriter ( System . out ) ; int n = sc . nextInt ( ) ; int arr [ ] = new int [ 101 ] ; boolean flag = false ; while ( n -- > 0 ) { int x = sc . nextInt ( ) ; for ( int i = 0 ; i < x ; i ++ ) { arr [ sc . nextInt ( ) ] ++ ; } } ArrayList < Integer > ans = new ArrayList < > ( ) ; int max = - 1 ; for ( int i = 0 ; i < 101 ; i ++ ) { max = Math . max ( max , arr [ i ] ) ; } for ( int i = 0 ; i < 101 ; i ++ ) { if ( arr [ i ] == max ) { ans . add ( i ) ; } } for ( int i : ans ) { System . out . print ( i + " ▁ " ) ; } System . out . println ( ) ; }
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