<?php
$s = trim(fgets(STDIN));
$cntW = 0;
$ans = 0;
for ($i = strlen($s) - 1; $i >= 0; $i--) {
	if ($s[$i] == 'w') {
		$cntW++;
		continue;
	} else if ($s[$i] == 'c') {
		$ans += $cntW * ($cntW - 1) / 2;
	}
}
print $ans;
?>