public static void main ( String [ ] args ) {
  int n = in . nextInt ( ) ;
  ArrayList < String > list = new ArrayList < String > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String cur = in . next ( ) ;
    if ( check ( cur ) ) list . add ( cur ) ;
  }
  long max = 0 ;
  for ( char i = 'a' ;
  i <= 'z' ;
  i ++ ) {
    for ( char j = 'a' ;
    j <= 'z' ;
    j ++ ) {
      long cur = getCost ( list , i , j ) ;
      max = Math . max ( cur , max ) ;
    }
  }
  System . out . println ( max ) ;
}

public static void main ( String [ ] args ) { int n = in . nextInt ( ) ; ArrayList < String > list = new ArrayList < String > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { String cur = in . next ( ) ; if ( check ( cur ) ) list . add ( cur ) ; } long max = 0 ; for ( char i = ' a ' ; i <= ' z ' ; i ++ ) { for ( char j = ' a ' ; j <= ' z ' ; j ++ ) { long cur = getCost ( list , i , j ) ; max = Math . max ( cur , max ) ; } } System . out . println ( max ) ; }
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