import math
def is_palindrome(num):
    if num < 10 and num > -10:
        return True
    numLen = len(str(num))
    tmpNum = num
    tmpDivide = numLen - 1
    while tmpDivide > 0:
        divide = pow(10, tmpDivide)

        first = int(tmpNum / divide)
        tmpLen = len(str(tmpNum))
        last = int(str(tmpNum)[tmpLen - 1])
        if first != last:
            return False
        tmpNum = int((tmpNum - first * divide - last) / 10)
        tmpDivide = tmpDivide - 2
    return True

output = filter(is_palindrome, range(10000, 20000))

print(list(output))