# your code goes here
mylist = ["hello","world","how","you","doing"]
letter = input("input a letter you would like to search ").lower()
words = list(filter(lambda s: s.startswith(letter), mylist))
print( len(words) )
for w in words: print ("\n"+w)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCgpteWxpc3QgPSBbImhlbGxvIiwid29ybGQiLCJob3ciLCJ5b3UiLCJkb2luZyJdCmxldHRlciA9IGlucHV0KCJpbnB1dCBhIGxldHRlciB5b3Ugd291bGQgbGlrZSB0byBzZWFyY2ggIikubG93ZXIoKQoKd29yZHMgPSBsaXN0KGZpbHRlcihsYW1iZGEgczogcy5zdGFydHN3aXRoKGxldHRlciksIG15bGlzdCkpCgpwcmludCggbGVuKHdvcmRzKSApCgpmb3IgdyBpbiB3b3JkczogcHJpbnQgKCJcbiIrdyk=