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, 2, ['q', 'w', 'D', 'A', '3751', 'G', '2419', 'V']

SOLUTION: w

PROBLEM: 3, 3, ['2047', 'R', '6885', '1243', 'Z']

SOLUTION: 5886

PROBLEM: 19, 21, ['3077', 'j', '4037', '7203', 'G', '325', 'K', 'V', '1979', '5763', 'S', 'W', 'C', '9773', '1255', '7755', 'q', 'Y', 'm', '1689', '2721', '1631', 'A', 'C', '4509', 'Q', 'q']

SOLUTION:
12729861m