how can i abi-decode a cast call?

[kirilligum]

I simply feed the result of a cast call to cast abi-decode and get an error

docker run --rm --net="host" ghcr.io/foundry-rs/foundry "cast abi-decode \"getConversationResponseLength(uint256,uint256)\" \$(cast call --private-key $USER_PRIVATE_KEY --rpc-url $RPC_URL $TRUST_AND_TEACH_ADDRESS \"getConversationResponseLength(uint256,uint256)\" 0 0)"
Error:
no data was decoded