TASK DEFINITION: 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.
PROBLEM: 5, 6, ['J', '6957', 's', 'l', 'C', 'o', 'H', 'u', 'g', 'P', 'N', 'v', 'S', '6145', 'o', 'z', 'B', 'o', 'E', 'f', '817', 'I', 'k', 'I', '7331', 'x']

SOLUTION: oC

PROBLEM: 1, 2, ['Q', '6249', 'm', 'H', 'x', 'b', 'Z', 'z', '15']

SOLUTION: 9426Q

PROBLEM: 2, 15, ['e', 'j', 'U', '5133', 'M', 'Y', 'd', '5569', 'C', 'W', '7531', 'y', '6895', 'K', '5061', '979']

SOLUTION:
1605K5986y1357WC9655dYM3315Uj