<?php
$f = 'CAN,CBN';
$words = explode(',', $f);
$a = $ao = $words[0];
$b = $bo = $words[1];
$win = '';

function splice($a,$cut) {
	$total = $high = 0;
	$ret = array();
	$arr = str_split($a);
	foreach ($arr as $key => $value) {
	    $total = $total + ord($value) - 64;
	    if ($value > $high){$high = $key;}		
	}
	$ret[0]=$total;
	if ($cut) { unset($arr[$high1]); $ret[1] = $arr; }
	return $ret;
}

while($win=='') {
	$ret1 = splice($a,FALSE);
	$ret2 = splice($b,FALSE);
	$ret3 = splice($ret1[0],TRUE);
	$ret4 = splice($ret2[0],TRUE);
	if($ret3[0] > $ret4[0]) { 
		$win = $ao;
	} else if ($ret3[0] < $ret4[0]) { 
		$win = $bo;
	} else if ((strlen($a)<1) OR (strlen($b)<1)) {
		if (strlen($a) < strlen($b)) { $win = $ao; }
		else if (strlen($b) < strlen($a)) { $win = $bo; }
		else { $win = 'STALEMATE'; }
	} 
}
echo $win;

?>

CBN