C }N_HMns find out the error in plain text induced
by one bit error in the cipher text. the file should be altleast 
sdfsdf
1232-32-321-321-321-321-321-32-321-321-312-3213
12321
3123
123
123
123
123
123
123
123
123
12
312
312
312
321312312312312312312313123123123123123123213123
123123213
123213123123123123
123123123123123
12312312312wdfs
fsd
filesdfsd
filesdfsdfsdf