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]: 1, 18, ['h', 'c', 'J', 'C', '2371', '7267', 'T', 'W', '1277', 's', 'g', '4555', 'n', 'g', '1535', '4369', '9577', 'R', 'p', '7441', 'r', '3533', 'h', '1045', '2211', 'g', '6349', 'i', '9305', '5295']
[EX A]: R775996345351gn5554gs7721WT76271732CJch

[EX Q]: 2, 12, ['p', 'o', '2673', 'd', 'r', 'n', 'Z', 'u', 'm', '5195', '6521', '7671']
[EX A]: 176712565915muZnrd3762o

[EX Q]: 20, 21, ['3335', '9721', '8247', 'X', 'A', '1593', '8051', 'x', 'M', 'n', '8817', 'I', 'j', '9787', 'V', 'L', '7075', '9883', '7383', '4943', 'o', '7507', '3307', 'R']
[EX A]:
o3494