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, ['5111', 'U', '441', '8381']

Ex Output:
U1115


Ex Input:
2, 10, ['R', 'g', '8909', '6051', '4011', 'T', 'P', '5051', 'u', '6287', '1069', '9051', 'K', 'G', 'o', 'b', '87', 'I', '6941', 'p', '6797', '8081', '6393', '4847', 'q', '8609', '739', 'P', '8443', 'C']

Ex Output:
7826u1505PT110415069098g


Ex Input:
4, 4, ['7009', 'U', 'w', '7809', 'k', '885', 'q', '2541', '1053', '4107', '7417', '8927', '8343', 'F', 'e', '7923', 'k', '4527', 's', 'V', '1617', 'U', '7345', '6697']

Ex Output:

9087