In this Kata, you will be given a number in form of a string and an integer `k` and your task is to insert `k` commas into the string and determine which of the partitions is the largest. 
```
For example:
solve('1234',1) = 234 because ('1','234') or ('12','34') or ('123','4').
solve('1234',2) = 34 because ('1','2','34') or ('1','23','4') or ('12','3','4'). 
solve('1234',3) = 4
solve('2020',1) = 202
```
More examples in test cases. Good luck!
Please also try [Simple remove duplicates](https://www.codewars.com/kata/5ba38ba180824a86850000f7)
def solve(st,k):
    return max([int(st[i:len(st)-k+i]) for i in range(0, k+1)])
def solve(st,k):
    return max([int(st[i:len(st)-k+i]) for i in range(0, k+1)])