Booking.com Backend Developer Willing to Learn Pearl interview questions

1. A file containing words. They asked me to write a program to find out most 5 repeating words. 2. Provided a set of characters and a list of words, how many of those words can we create from the input characters ? input: chars = 'atuslirabocynkebbterasiuaracnbawp' words = ['car','boat','plane','bus','shuttle'] output: car => 2 boat => 1 plane => 1 bus => 2 shuttle => 0