How to create some random or unique value in a CloudFormation template?

Is there a way to create some kind of random or unique value in a CloudFormation template? Why I need this. In our templates we have a number of custom-named resources, for instance AWS::AutoScaling::LaunchConfiguration with specified LaunchConfigurationName or AWS::AutoScaling::AutoScalingGroup with specified AutoScalingGroupName. When updating stacks, we often get the following error: CloudForma

[plasma0713]

“If you just need a random ID (no passwords, no fancy requirements), the way I'd recommend is using a portion of AWS::StackId, which is in the following format:”