<?php
while ($line = fgets(STDIN)) {
	$s[] = trim($line);
}
foreach ($s as $key => $value) {
	$array[] = explode(" ", $value);
}
$lines = array_splice($array, 0, 1);

for ($i=1; $i<$lines[0][0]; $i++) {
    $arr_min[] = $array[0][$i] - $array[0][$i-1];
}

sort($arr_min);
echo $arr_min[0].PHP_EOL;
$arr_max = $array[0][count($array[0]) - 1] - $array[0][0];
echo $arr_max;
?>