Complete the program given. This program reads the grades stored in the result.txt file, then it calculates the number of each grade obtained by each student and stores the result in the summary.txt file. The result.txt is shown as below:

$1001$ Aina A A A B A

$1002$ Asmah D A B A B

$1003$ Adam A A A B A

$1010$ Zaharah C B B B B

$1011$ Zurina A A B B A