def move(n, a, b, c):
if n ==1:
print a, '-->', c
return
print a,'-->',b
move(n-1, a, b, c)
print b,'-->',c
move(4, 'A', 'B', 'C')
import sys
item=('h','e','l','l','o',',',' ','p','y','t','h','o','n')
for i in item:
sys.stdout.write(i)
