what is the logic of month program. in that months how many repeated alphabets dispaly a number

I am doing this type but it will show error message

DATA : I_MONTH TYPE  TABLE OF T015M .

*       I_ALPHABET(1) TYPE C.

*       WA_MONTH TYPE T015M OCCURS 0.

DATA : NUMBER TYPE MATCH_RESULT_TAB .

DATA : N TYPE I.

DATA : ALPHABET(1) TYPE C.

DATA : MONTH TYPE I.

*SELECT * FROM T015M INTO TABLE I_MONTH UP TO 10 ROWS.

LOOP .

  N = 1.

  ALPHABET = SY-ABCDE+N.

  FIND ALL OCCURRENCES OF  ALPHABET IN  TABLE  I_MONTH RESULTS NUMBER .

  IF SY-SUBRC = 0.

    WRITE : alphabet,number

  ENDIF.

  CLEAR : ALPHABET,NUMBER .
ENDLOOP.