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 Q]: 7, 10, ['417', '8131', '7239', '9699', 'z', 'H', 'P', '9349', '4835', '3217', '9899']
[EX A]: 712353849439P

[EX Q]: 8, 8, ['911', 'n', '261', 'J', '1181', '6903', '2085', '5225', 'N', '4041', '4891', '6241']
[EX A]: 5225

[EX Q]: 13, 21, ['2969', 'y', 'N', 'c', 'N', '6337', 'R', '4757', '7987', '7329', '2201', 'Z', '5527', 'e', 'f', '849', 'f', 'V', '5465', 'G', '8515', 'A', 'Z', 'P']
[EX A]:
5158G5645Vf948fe7255