How to get access to the private key for an account when creating a private network using ./sandbox up?

Hi,

I am able to deploy my smart contract and send some data to the Algorand testnet blockchain. Based on my understanding, testnet blockchain is a public blockchain but I need to test on the private Algorand blockchain. When I run the private Algorand blockchain using Sandbox, it will start with three pre-loaded accounts. I can see the account addresses but in order to create my app on the blockchain, I need to have the private key as well. Could you please let me know how I can get the private keys for the three pre-loaded accounts in the Algorand private network?

Thank you in advance for your time,
Sahand

This commant shows your accounts

goal account list

This command shows mnemonic to the acocunt

goal account export -a [ACCT]
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Thank you very much for your response. That answers my question.