print$($is$\_$palindrome$\_$stack$("$racecar$"))$ # Expected output: True

print$($is$\_$palindrome$\_$stack$("$Otto$"))$ # Expected output: True

print$($is$\_$palindrome$\_$stack$("$Able was I ere I saw Elba"$))$ # Expected output: True

print$($is$\_$palindrome$\_$stack$("$A man, a plan, a canal, Panama!"$))$ # Expected output: True

print$($is$\_$palindrome$\_$stack$("$Not a palindrome"$))$ # Expected output: False