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]: 4, 5, ['3349', '9445', '703', 'k', '3191', '4473', 'K', '3417', '8305', '8781', 'K', 'v', 'O', 'Y', '4375', 'o']
[EX A]: 1913k

[EX Q]: 3, 15, ['5807', 'M', 'A', 'm', '4557', 'P', 'y', '2895', 'K', 'K', '5379', '2367', 'M', '8653', '3847', 'D', '7725', '6571', 'L', '2011', 'h']
[EX A]: 74833568M76329735KK5982yP7554mA

[EX Q]: 20, 23, ['8907', '1395', 'p', 'U', '8533', 'T', '7785', 'w', '3507', '1527', '7539', '3327', 'J', 'M', '2079', 'a', '4849', 'p', '2539', '1383', '3259', '605', '3551', 'V']
[EX A]:
155350695233831