#!/usr/bin/python3

def main():
	mylist=[i for i in range(20)]
	print(mylist)
	c=filter(lambda x:x%2==0,mylist)
	count=list(c)
	print(f"πλήθος άρτιων στη λίστα: {len(count)}")
if __name__=="__main__":
	main()