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: 3, 12, ['2159', 'f', 'u', '2675', '7357', '9325', '1275', '8897', 'I', '2095', '5835', '577', 'g', '2783', '7843', '8517', '4185', '5847', '2645', '2357', 'l', 'v', '2239', '141', 'o', '2529', '7977', '8445', '2363']

SOLUTION: 77553855902I79885721523975375762u

PROBLEM: 7, 9, ['5683', 'M', '3363', 'H', '161', '6767', 'w', 'j', 't']

SOLUTION: tjw

PROBLEM: 2, 18, ['m', '7773', '4811', '6887', 'Q', '9671', 'a', 'z', '2671', '7487', 'k', '8675', '8251', '6859', '9367', 'O', 'X', 'm', '6061']

SOLUTION:
mXO7639958615285768k78471762za1769Q788611843777