<script>

String.prototype.reverse=function(){return this.split("").reverse().join("");}

String.prototype.replaceAt=function(index, char) {
      return this.substr(0, index) + char + this.substr(index+char.length);
   }

function include(arr,obj) {
    return arr.indexOf(obj);
}

var alphabet =

['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w'

,'x','y','z'];

var city_list = ["New York"];

var list = [
"Elephant",
"Alligator",
"Kestrel",
"Condor",
"Arctic Fox",
"Bald Eagle",
"Black Swan",
"Duck",
"Burrowing Owl",
"Sea Lion",
"Chinchilla",
"Collared Peccary",
"Rabbit",
"Snake",
"Hedgehog",
"Owl",
"Bear",
"Leopard",
"Shark",
"Panda",
"Lynx",
"Llama",
"Marine Toad",
"Mouflon",
"Musk Ox",
"Arrow Frogs",
"Porcupine",
"Tortoise",
"Red Panda",
"Lemur",
"Hawk",
"Rhea",
"Reindeer",
"Siberian Tiger",
"Snow Leopard",
"Snowy Owl",
"Whites Tree Frog",
"Wild Boar",
"Invertebrates",
"Centipedes",
"Crustaceans",
"Hermit Crabs",
"Wood Louse",
"Bullet Ant",
"Carpenter Bee",
"Honey Pot Ant",
"Honeybee",
"Snails",
"Spiders",
"Scorpions",
"Fish",
"Zebra",
"Tiger",
"Crocodiles",
"Lizards",
"Snakes",
"King Cobra",
"Turtles",
"Birds",
"Penguins",
"Bats",
"Cheetah",
"Mongoose",
"Jaguar",
"Kinkajou",
"Lion",
"Otter",
"Polar Bear",
"Puma",
"Red Panda",
"Sand Cat",
"Slender",
"Hyena",
"Rhinoceros",
"Gazelle",
"Goat",
"Hippopotamus",
"Okapi",
"Pig",
"Warthog",
"Hyraxes",
"Lemurs",
"Monkey",
"Ape",
"Chimpanzee",
"Gorilla",
"Kangaroo",
"Opossum",
"Giraffe",
"Killer Whale",
"Horse",
"Wolf",
"Mole",
"Dingo",
"Deer",
"Emu",
"Crocodile",
"Bobcat",
"Lion",
"Squirrel"
];

for(var i=0;i<city_list.length;i++) {
  city_list[i] = city_list[i].toLowerCase();
}

for(var i=0;i<list.length;i++) {
  var result, word = list[i].toLowerCase();
  var fifth = word.substring(4,5);

  // search 5th char index
  var fifth_alp = include(alphabet, fifth);

  // change 5th char to next
  result = word.replaceAt(4, alphabet[fifth_alp + 1]);

  // remove 2nd char
  result = result.replaceAt(1, "");

  // reverse word
  result = result.reverse();

  // print
  document.write(list[i] + " => " + result);

  // check match city
  if(include(city_list, result) != -1) {
     document.write("  Found !!");
  }

  document.write("<br />");

}


</script>