In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting string. 'i' and 'j' will be non-negative, and will always have a value less than the length of A. 'i' will always be less than 'j'. Perform the operations in order, i.e., do not reverse first and then concatenate.

1, 7, ['P', 'h', '1443', 'b', 'K', '2641', '3831']
13831462Kb3441hP

2, 9, ['3441', 'a', 'o', 'B', 'e', 'u', 'B', 'Z', '1287', '323', '5849', 'F', '7917', '1023', '6323', 'A', 'v', '491', '6123', '5949', '1409', 'I', '6889']
7821ZBueBoa

5, 16, ['y', '3351', '4557', 'd', 'Z', 'z', '6921', 'O', 'K', '4179', 's', '117', 'U', 'A', '7775', 'B', '2769', '795']

B5777AU711s9714KO1296zZ