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[newbie-schemer]

Hello! I am having problem using the higher-order function foldl to search for the maximum element in a list.
For a list containing elements as follows, there are no problems using the higher-order functions to find the maximum:

((12) (67) (9))

But I am having problems for lists accompanied by a symbol, as shown below:

((john 23) (paul 87) (tom 76))

How can I make sure that the folding is done only on the cdr of the sublists?