Aggregation exercise: Test failure in exercism but works fine in ABAP editor

[ankitagarwal02]

Exercise code -

CLASS zcl_itab_aggregation DEFINITION
  PUBLIC
  FINAL
  CREATE PUBLIC .

  PUBLIC SECTION.
    TYPES group TYPE c LENGTH 1.
    TYPES: BEGIN OF initial_numbers_type,
             group  TYPE group,
             number TYPE i,
           END OF initial_numbers_type,
           initial_numbers TYPE STANDARD TABLE OF initial_numbers_type WITH EMPTY KEY.

    TYPES: BEGIN OF aggregated_data_type,
             group   TYPE group,
             count   TYPE i,
             sum     TYPE i,
             min     TYPE i,
             max     TYPE i,
             average TYPE f,
           END OF aggregated_data_type,
           aggregated_data TYPE STANDARD TABLE OF aggregated_data_type WITH EMPTY KEY.

    METHODS perform_aggregation
      IMPORTING
        initial_numbers        TYPE initial_numbers
      RETURNING
        VALUE(aggregated_data) TYPE aggregated_data.
  PROTECTED SECTION.
  PRIVATE SECTION.

ENDCLASS.

CLASS zcl_itab_aggregation IMPLEMENTATION.

  METHOD perform_aggregation.
    DATA: lv_group_average TYPE f.

    LOOP AT initial_numbers ASSIGNING FIELD-SYMBOL(<lfs_init_number>)
                                      GROUP BY ( key = <lfs_init_number>-group
                                                 count = GROUP SIZE )
                                      ASSIGNING FIELD-SYMBOL(<lfs_group>).

      DATA(lv_group_sum) = REDUCE i( INIT lv_sum TYPE i
                                    FOR ls_group_sum IN GROUP <lfs_group>
                                    NEXT lv_sum += ls_group_sum-number ).

      DATA(lv_group_min) = REDUCE i( INIT lv_min = '99999'
                                     FOR ls_group_min IN GROUP <lfs_group>
                                     NEXT lv_min = nmin( val1 = lv_min
                                                                        val2 = ls_group_min-number ) ).

      DATA(lv_group_max) = REDUCE i( INIT lv_max TYPE i
                                     FOR ls_group_max IN GROUP <lfs_group>
                                     NEXT lv_max = nmax( val1 = lv_max
                                                                         val2 = ls_group_max-number ) ).

      APPEND VALUE #( group = <lfs_group>-key
                                  count = <lfs_group>-count
                                  sum = lv_group_sum 
                                  min = lv_group_min
                                  max = lv_group_max
                                  average = ( lv_group_sum / <lfs_group>-count ) ) TO aggregated_data.
    ENDLOOP.

  ENDMETHOD.

ENDCLASS.

Not sure what is wrong here. Things look fine to me.