public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  for ( int j = 0 ;
  j < n ;
  j ++ ) {
    int k = sc . nextInt ( ) ;
    int temp = 0 , res = 0 ;
    String students = sc . next ( ) ;
    char [ ] a = new char [ k ] ;
    a = students . toCharArray ( ) ;
    for ( int x = 0 ;
    x < k ;
    x ++ ) {
      a [ x ] = students . charAt ( x ) ;
    }
    for ( int i = k - 1 ;
    i >= 0 ;
    i -- ) {
      if ( a [ i ] == 'A' ) {
        res = Math . max ( res , temp ) ;
        temp = 0 ;
      }
      else {
        temp ++ ;
      }
    }
    System . out . println ( res ) ;
  }
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; for ( int j = 0 ; j < n ; j ++ ) { int k = sc . nextInt ( ) ; int temp = 0 , res = 0 ; String students = sc . next ( ) ; char [ ] a = new char [ k ] ; a = students . toCharArray ( ) ; for ( int x = 0 ; x < k ; x ++ ) { a [ x ] = students . charAt ( x ) ; } for ( int i = k - 1 ; i >= 0 ; i -- ) { if ( a [ i ] == ' A ' ) { res = Math . max ( res , temp ) ; temp = 0 ; } else { temp ++ ; } } System . out . println ( res ) ; } }
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