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: 4, 5, ['3001', '661', 'S', 'N', '7919']

SOLUTION: 9197N

PROBLEM: 3, 6, ['643', 'X', 'F', '7453', '8495', '7943']

SOLUTION: 349759483547F

PROBLEM: 4, 12, ['3625', 'u', '6493', 'U', 't', '383', 't', 'J', '6423', 'w', '6581', '4969', 'E', '8727', 'n']

SOLUTION:
96941856w3246Jt383tU