instruction:
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.
question:
1, 4, ['3633', 'k', '9685', 't']
answer:
t5869k3363


question:
2, 7, ['9969', 'u', '9811', 't', 'z', '8347', 'i', 'O', '5897']
answer:
i7438zt1189u


question:
1, 14, ['3935', 'P', '3077', '1623', '165', 't', 'L', '7455', '1265', '9799', 'd', 'w', 'g', 'M', '807', '1943']
answer:

Mgwd997956215547Lt56132617703P5393