How to implement when inputting an uncertain number or an uncertain number of lines in Python?

When I do exercises, I will encounter that the length in the array is uncertain , And require input , How to input at this time ?
When I write and input oneortwo, I can , But no more ideas

a,b=int(input().split())

Or use

a,b=eval(input())

If the input encountered is uncertain , I don't understand , Come to a big guy to help me ！！！
I can't find the specific type of questions for the time being , But I feel I've met many , No idea ......

The number of fixed inputs is
m,n = map(int,input().split())
Uncertain number of inputs , Generating a list is
lst = list(map(int,input().split()))

If help , Please click... Below my answer 【 Adopt the answer 】 Button to help adopt , thank you !