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, 2, ['S', '7763']
[EX A]: 3677S

[EX Q]: 2, 12, ['W', 'R', 'P', '9411', '179', '5175', '7959', 'o', '4285', 'H', '7535', '3423', 'Q', '7813', '611']
[EX A]: 32435357H5824o959757159711149PR

[EX Q]: 3, 11, ['1727', 'Q', '3433', 'K', 'u', 'O', 'Q', 'y', 'p', '4849', '1491', 'e']
[EX A]:
19419484pyQOuK3343