int $gaps[]; 

int $i, $count;

// Get all the gaps.

$gaps = `getGaps "RFWT"`;

// Print out their sizes.

$count = `getCount $gaps`;

for( $i = 0; 

     $i < $count; 

     $i += 2 )

        { 

           print int( $gaps[$i+1] - $gaps[$i] + 1 );

}