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.

Ex Input:
1, 2, ['3303', '6127']

Ex Output:
72163033


Ex Input:
5, 12, ['6701', '3911', '1591', '3829', '3381', 'J', '8635', 'r', '8867', 'N', '2397', '1677', 'c', '9799']

Ex Output:
77617932N7688r5368J1833


Ex Input:
2, 20, ['J', 'F', '2973', 'z', '5255', 'v', '1003', 'l', 'h', '6873', '2873', '4375', '7379', 'S', 'v', 'h', 't', 'c', '3703', 'M', 's', 'f', 'M', 'h', 'L', '983', 'n', '9089']

Ex Output:

M3073cthvS9737573437823786hl3001v5525z3792F