from __future__ import print_function
import sys

start = int( sys.argv[1] )
end = int( sys.argv[2] )

lines = open( sys.argv[3], "r" ).readlines()

nlines = len(lines)

if start < 0:
    start = 0
elif start >= nlines:
    start = nlines-1

if end >= nlines:
    end = nlines-1
elif end < 0:
    end = 0

if end >= start:
    for i in range(start, end+1):
        print(lines[i], end="")
else:
    for i in range(start, end-1, -1):
        print(lines[i], end="")