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

// echo (ord($a)-64);
$high1 = 0;
$high2 = 0;
$total1 = 0;
$total2 = 0;
$total3 = 0;
$win = '';

while($win=='') {

	$arr1 = str_split($a);
	foreach ($arr1 as $key => $value) {
		$total1 = $total1 + ord($value) - 64;
	}
	$arr2 = str_split($b);
	foreach ($arr2 as $key => $value) {
		$total2 = $total2 + ord($value) - 64;
	}
	$arr3 = str_split($total1);
	foreach ($arr3 as $key => $value) {
		$total3 = $total3 + $value;
		if ($value > $high1){
			$high1 = $key;
		}
	}
	$arr4 = str_split($total2);
	foreach ($arr4 as $key => $value) {
		$total4 = $total4 + $value;
		if ($value > $high2){
			$high2 = $key;
		}
	}
	if($total3 > $total4) { 
		$win = $ao;
	} else if ($total4 > $total3) { 
		$win = $bo;
	} else if ((strlen($a)==1) OR (strlen($b)==1)) {
		$win = 'STALEMATE';
	} else {
		unset($arr1[$high1]);
		unset($arr2[$high2]);
                $a = implode($arr1);
                $b = implode($arr2); 
	}
}
echo $win;

?>

CBN