Maximum of a list X40606

The maximum of a list $t$ is the largest element that it contains. For example, the maximum of $[1, 2, 3]$ is 3, the maximum of $[1, [2, 3], 4]$ is 4, and the maximum of $[[[1]]]$ is 1. The maximum of $[]$ is defined to be 0.

Write a program that prints the maximum of every given list.

Define and use a recursive function

maximum(t)

that returns the maximum of a list $t$.

Hint

Using the @ast@ package, you can extract the list $t$ encoded in a string $s$ with @t = ast.literal_eval(s)@.

Input

The input consists of several lists of non-negative numbers.

Output

Print the maximum of every given list.