Given this Python code using boto3, what will be the output if the subscription is successful?

Given this Python code using boto3, what will be the output if the subscription is successful?

import boto3
sns = boto3.client('sns')
response = sns.subscribe(
    TopicArn='arn:aws:sns:us-east-1:123456789012:MyTopic',
    Protocol='email',
    Endpoint='user@example.com'
)
print(response['SubscriptionArn'])