public static void main ( String [ ] args ) {
  FastScanner input = new FastScanner ( ) ;
  int n = input . nextInt ( ) ;
  String s = input . next ( ) ;
  long firstcount = 0 ;
  long lastcount = 0 ;
  char first = s . charAt ( 0 ) ;
  char last = s . charAt ( n - 1 ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( s . charAt ( i ) == first ) firstcount ++ ;
    else break ;
  }
  for ( int i = n - 1 ;
  i >= 0 ;
  i -- ) {
    if ( s . charAt ( i ) == last ) lastcount ++ ;
    else break ;
  }
  if ( first == last ) {
    System . out . println ( ( firstcount + 1 ) * ( lastcount + 1 ) % mod ) ;
  }
  else {
    System . out . println ( 1 + firstcount + lastcount ) ;
  }
}

public static void main ( String [ ] args ) { FastScanner input = new FastScanner ( ) ; int n = input . nextInt ( ) ; String s = input . next ( ) ; long firstcount = 0 ; long lastcount = 0 ; char first = s . charAt ( 0 ) ; char last = s . charAt ( n - 1 ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( s . charAt ( i ) == first ) firstcount ++ ; else break ; } for ( int i = n - 1 ; i >= 0 ; i -- ) { if ( s . charAt ( i ) == last ) lastcount ++ ; else break ; } if ( first == last ) { System . out . println ( ( firstcount + 1 ) * ( lastcount + 1 ) % mod ) ; } else { System . out . println ( 1 + firstcount + lastcount ) ; } }
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