英语字谜 My first letter is in“fat”,not in“hat”,my second letter is in “dad”,not in“bed”

英语字谜 My first letter is in“fat”,not in“hat”,my second letter is in “dad”,not in“bed”
My first letter is in“fat”,not in“hat”,my second letter is in “dad”,not in“bed”,my third letter is in“nice”,not in“nine”,my fourth letter is in “sheep”,not in“ship”.What am