instruction:
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.
question:
2, 16, ['6623', 'E', 'S', '8679', '7465', '2769', 'G', '9635', 'Z', 'Y', '6593', '9535', '5247', '2185', '7071', 'P', '7897', 'm']
answer:
P17075812742553593956YZ5369G967256479768SE


question:
4, 9, ['6451', '9261', 's', '5587', 'D', '7595', 'D', 'E', 's', '8841', 'Y']
answer:
sED5957D7855


question:
3, 9, ['W', 'o', 'D', 'l', '2015', '7623', 'p', 'V', 'U', 'S', '3085', 'f', '7377', 'Z', '5783', '433', '1509', 'Y', 't', '8599', 'C', '1', '1543', 'W', 't', 'l']
answer:

UVp32675102lD