Fix subject

subjects/nbrconvertalpha.en.md

@@ -12,14 +12,14 @@ A flag `--upper` should be implemented. When used the program prints the result
 
 ```console
 student@ubuntu:~/student/test$ go build
-student@ubuntu:~/student/test$ ./nbrconvertalpha | cat -e
-$
+student@ubuntu:~/student/test$ ./nbrconvertalpha
 student@ubuntu:~/student/test$ ./nbrconvertalpha 8 5 12 12 15 | cat -e
 hello$
 student@ubuntu:~/student/test$ ./nbrconvertalpha 12 5 7 5 14 56 4 1 18 25 | cat -e
 legen dary$
 student@ubuntu:~/student/test$ ./nbrconvertalpha 32 86 h | cat -e
    $
-student@ubuntu:~/student/test$ ./nbrconvertalpha --upper 8 5 25  | cat -e
+student@ubuntu:~/student/test$ ./nbrconvertalpha --upper 8 5 25
 HEY$
+student@ubuntu:~/student/test$
 ```