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: 2, 6, ['6717', '6639', 'l', 'i', 'o', '1819']

SOLUTION: 9181oil9366

PROBLEM: 1, 2, ['6627', 'J']

SOLUTION: J7266

PROBLEM: 4, 18, ['4575', 'I', 'j', 'd', 'O', 'b', '9447', 'T', '6557', 'F', '5669', 't', 'U', '6059', 'V', 'R', '193', 'q']

SOLUTION:
q391RV9506Ut9665F7556T7449bOd