How to get response value from function B to function A

I am invoking a lambda function (Function B) in another lambda function (Function A). as you can see in the code: Function A

import json
import boto3
client = boto3.client('lambda')

def lambda_handler(event, context):
    ab = {
        'a': 'A',
        'b': 'B'
        }
    
    Response = client.invoke(
        FunctionName = 'arn:aws:lambda:us-west-2:747966+1193930:function:toInvoke',
        InvocationType = 'RequestResponse',
        Payload = json.dumps(ab)
        )
    print(Response)

Function B

import json

def lambda_handler(event, context):
    a = "I am Rehan"
    print(a)
    return a

I want to get the value of the function B in Response but it is giving me response like this:

{'ResponseMetadata': {'RequestId': 'f70db108-a9f44747474740-345367b39c53', 'HTTPStatusCode': 200, 'HTTPHeaders': {'date': 'Tue, 31 May 2022 06:55:20 GMT', 'content-type': 'application/json', 'content-length': '12', 'connection': 'keep-alive', 'x-amzn-requestid': 'f70db108-a9f4-36363636363667b39c53', 'x-amzn-remapped-content-length': '0', 'x-amz-executed-version': '$LATEST', 'x-amzn-trace-id': 'root=1-6295bbd8-7e71eebd66666666655;sampled=0'}, 'RetryAttempts': 0}, 'StatusCode': 200, 'ExecutedVersion': '$LATEST', 'Payload': <botocore.response.StreamingBody object at 0x7f355556ed430>}