need urgent help please

English Indicate how many characters ' A, ' B ', ' C ' and ' D ' are printed on standard output by the following program. If for example the displayed characters are characters 'A', 3 characters ' B', 5 characters ' C ', and 20 characters ' D ', report the answer exactly in the following format: A=6 B=3 C=5 D=20. ID Domanda / Question ID: FORK \& EXEC