How to get only value of SQL query without header using groovy

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Groovy

SoapUI

I tried to fetch only DB value using groovy script but result includes the value along with header.

def res = con.rows("select fkuserid from tblUserCardDetail where cardValue='111633072'" )
log.info "The User ID from DB is :" + res

Result is coming like this : Mon Apr 25 06:51:07 PDT 2016:INFO:The User ID from DB is :[[fkuserid:2951]]

I want only value : 2951

What I have tried:

def (value1, value2) = res.split(':')

I tried to split the result but error comes :

No signature of method: java.util.ArrayList.split() is applicable for argument types: (java.lang.String) values: [:] Possible solutions: split(groovy.lang.Closure), split(groovy.lang.Closure), wait(), sort(), asList(), toList()