"Create a method to accept one arbitrary string as an argument, and return a string of length 26. The objective is to detect if letters of the alphabet (upper or lower case) are present anywhere in the string, and to set each of the 26 characters corresponding to each letter to either '1' if present, '0' if not."

string search

def change a 
  # put your code here!
  b = a.split("")
  c = "abcdefghijklmnopqrstuvwxyz"
  d = c.split("")
  e = Hash.new
  e = d.each {|x| e[x] = 0}
  
  b.each {|x| 
    if b.include?(x) && d.include?(x)
       e[x] = 1
    end }
end