python循环从用户处获得一组数据,直到用户直接输入a退出，打印输出所有数据的和

请问这个怎么写

sum = 0

while True:
    a = input("Please enter a number (enter letter a to stop): ")
    if a == 'a':
        break;
    sum += int(a)

print(f"The sum of all the numbers is: {sum}.")


# Output 
Please enter a number (enter letter a to stop): 1
Please enter a number (enter letter a to stop): 2
Please enter a number (enter letter a to stop): 3
Please enter a number (enter letter a to stop): 4
Please enter a number (enter letter a to stop): 5
Please enter a number (enter letter a to stop): 6
Please enter a number (enter letter a to stop): 7
Please enter a number (enter letter a to stop): 8
Please enter a number (enter letter a to stop): 9
Please enter a number (enter letter a to stop): 10
Please enter a number (enter letter a to stop): a
The sum of all the numbers is: 55.

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