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]: 3, 10, ['9543', '2797', '3939', '8207', '329', 'l', '5353', '8849', '5579', '7445']
[EX A]: 5447975594883535l92370289393

[EX Q]: 3, 20, ['x', 'S', 's', 'a', '5077', 'D', '3979', 'I', '3129', 'R', '8517', 'r', 'l', 'K', 'N', '9701', '227', 'n', '9385', 'U']
[EX A]: U5839n7221079NKlr7158R9213I9793D7705as

[EX Q]: 1, 3, ['8049', 'T', 'P', 'P']
[EX A]:
PT9408