d={'0':' ','2':'abc','3':'def','4':'ghi','5':'jkl','6':'mno','7':'pqrs','8':'tuv','9':'wxyz'}\x0d
print ''.join(d[p[0]][len(p)-1] for p in raw_input().split('1')[:-1])\x0d
Note that non-ascii characters in the above source code will be escaped (such as \x9f).