public static void main ( String args [ ] ) throws IOException {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  List < String > words = new ArrayList < String > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String s = sc . next ( ) ;
    Set < Character > set = new HashSet < Character > ( ) ;
    boolean valid = true ;
    for ( int j = 0 ;
    j < s . length ( ) ;
    j ++ ) {
      set . add ( s . charAt ( j ) ) ;
      if ( set . size ( ) > 2 ) {
        valid = false ;
        break ;
      }
    }
    if ( valid ) words . add ( s ) ;
  }
  int max = 0 ;
  for ( int i = 0 ;
  i < 26 ;
  i ++ ) {
    for ( int j = i + 1 ;
    j < 26 ;
    j ++ ) {
      char c1 = ( char ) ( i + 'a' ) ;
      char c2 = ( char ) ( j + 'a' ) ;
      int curr = 0 ;
      for ( String s : words ) {
        boolean valid = true ;
        for ( int k = 0 ;
        k < s . length ( ) ;
        k ++ ) {
          char c = s . charAt ( k ) ;
          if ( c != c1 && c != c2 ) {
            valid = false ;
            break ;
          }
        }
        if ( valid ) curr += s . length ( ) ;
      }
      max = Math . max ( curr , max ) ;
    }
  }
  System . out . println ( max ) ;
}

public static void main ( String args [ ] ) throws IOException { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; List < String > words = new ArrayList < String > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { String s = sc . next ( ) ; Set < Character > set = new HashSet < Character > ( ) ; boolean valid = true ; for ( int j = 0 ; j < s . length ( ) ; j ++ ) { set . add ( s . charAt ( j ) ) ; if ( set . size ( ) > 2 ) { valid = false ; break ; } } if ( valid ) words . add ( s ) ; } int max = 0 ; for ( int i = 0 ; i < 26 ; i ++ ) { for ( int j = i + 1 ; j < 26 ; j ++ ) { char c1 = ( char ) ( i + ' a ' ) ; char c2 = ( char ) ( j + ' a ' ) ; int curr = 0 ; for ( String s : words ) { boolean valid = true ; for ( int k = 0 ; k < s . length ( ) ; k ++ ) { char c = s . charAt ( k ) ; if ( c != c1 && c != c2 ) { valid = false ; break ; } } if ( valid ) curr += s . length ( ) ; } max = Math . max ( curr , max ) ; } } System . out . println ( max ) ; }
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