[R] How to get the item in list that is a number?

[Peng Yu]

I have the following list. The second item in the list is a number.
I'm wondering how to write R code to return this information for any
list?


$`1`
integer(0)

$`2`
[1] 123

$`3`
integer(0)

$`4`
integer(0)

$`5`
integer(0)