Write a program that:

Prompts the user for a file name.

Opens the file in binary mode, using the$"$rb$"$mode of the$$open$$function$.$ The files can be found in the directory$"/$src$/".$

If the file does not exist, then the program should print$"$No file named $\{$file name$\}$ could be found".

Calculates an XOR checksum by performing byte$-$wise XOR operations for every byte in the file.

Prints out$"$The checksum is $"$where$$is a single byte in hexadecimal format $($e$.$g$.$xB$2).$

Example:$$Let$$s assume that the file$$a$.$bin$$contains three bytes:

$0$x$01,0$x$02$and$0$x$01.$

Then the XOR checksum is:

$0$x$01^0$x$02^0$x$01=0$x$02.$

Input

Input consists of:

A filename containing the binary file to be processed.

Output

Output consists of either$"$No file named $\{$file name$\}$ could be found"$$or$"$The checksum is $"$where$$is a single byte in hexadecimal format, such as$$xB$2.$