public static void main ( String [ ] args ) {
  long PRIME = 1000000007 ;
  Scanner sc = new Scanner ( System . in ) ;
  int N = Integer . parseInt ( sc . next ( ) ) ;
  int M = Integer . parseInt ( sc . next ( ) ) ;
  long [ ] x = new long [ N ] ;
  long [ ] y = new long [ M ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) x [ i ] = Long . parseLong ( sc . next ( ) ) ;
  for ( int j = 0 ;
  j < M ;
  j ++ ) y [ j ] = Long . parseLong ( sc . next ( ) ) ;
  Arrays . sort ( x ) ;
  Arrays . sort ( y ) ;
  long xans = 0 ;
  long yans = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    xans = ( xans + ( i - ( N - 1 - i ) ) * x [ i ] ) % PRIME ;
  }
  for ( int j = 0 ;
  j < M ;
  j ++ ) {
    yans = ( yans + ( j - ( M - 1 - j ) ) * y [ j ] ) % PRIME ;
  }
  System . out . println ( ( xans * yans ) % PRIME ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { long PRIME = 1000000007 ; Scanner sc = new Scanner ( System . in ) ; int N = Integer . parseInt ( sc . next ( ) ) ; int M = Integer . parseInt ( sc . next ( ) ) ; long [ ] x = new long [ N ] ; long [ ] y = new long [ M ] ; for ( int i = 0 ; i < N ; i ++ ) x [ i ] = Long . parseLong ( sc . next ( ) ) ; for ( int j = 0 ; j < M ; j ++ ) y [ j ] = Long . parseLong ( sc . next ( ) ) ; Arrays . sort ( x ) ; Arrays . sort ( y ) ; long xans = 0 ; long yans = 0 ; for ( int i = 0 ; i < N ; i ++ ) { xans = ( xans + ( i - ( N - 1 - i ) ) * x [ i ] ) % PRIME ; } for ( int j = 0 ; j < M ; j ++ ) { yans = ( yans + ( j - ( M - 1 - j ) ) * y [ j ] ) % PRIME ; } System . out . println ( ( xans * yans ) % PRIME ) ; sc . close ( ) ; }
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