public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  String s [ ] = new String [ n ] ;
  int max = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    s [ i ] = input . next ( ) ;
  }
  int len = 0 ;
  for ( char i = 'a' ;
  i <= 'z' ;
  i ++ ) {
    for ( char j = 'a' ;
    j <= 'z' ;
    j ++ ) {
      len = 0 ;
      for ( int k = 0 ;
      k < n ;
      k ++ ) {
        String test = s [ k ] ;
        String x = String . valueOf ( i ) ;
        String y = String . valueOf ( j ) ;
        test = test . replaceAll ( x , "" ) ;
        test = test . replaceAll ( y , "" ) ;
        if ( test . length ( ) == 0 ) {
          len += s [ k ] . length ( ) ;
        }
      }
      max = Math . max ( len , max ) ;
    }
  }
  System . out . println ( max ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; String s [ ] = new String [ n ] ; int max = 0 ; for ( int i = 0 ; i < n ; i ++ ) { s [ i ] = input . next ( ) ; } int len = 0 ; for ( char i = ' a ' ; i <= ' z ' ; i ++ ) { for ( char j = ' a ' ; j <= ' z ' ; j ++ ) { len = 0 ; for ( int k = 0 ; k < n ; k ++ ) { String test = s [ k ] ; String x = String . valueOf ( i ) ; String y = String . valueOf ( j ) ; test = test . replaceAll ( x , " " ) ; test = test . replaceAll ( y , " " ) ; if ( test . length ( ) == 0 ) { len += s [ k ] . length ( ) ; } } max = Math . max ( len , max ) ; } } System . out . println ( max ) ; }
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