#!/usr/bin/env python
import sys
N = 350
name = sys.argv[1] if len(sys.argv) > 1 else "/dev/stdin"
with open(name, "r") as f:
  data = ' \\ '.join(f.read().splitlines())
s = len(data)
mw = len(str(2*s/N))-1
mw += s > ((N-2)*9-18*mw+1)*((10**mw-1)/9)-mw
p=0
i=1
while (p<s):
  lw = N-mw-2-len(`i`)
  print data[p:p+lw]
  i+=1
  p+=lw