## Algorithm

Problem Name: Python - Set .discard(), .remove() & .pop()

In this HackerRank Functions in PYTHON problem solution,

.remove(x)

This operation removes element

from the set.
If element

does not exist, it raises a KeyError.
The .remove(x) operation returns None.

Example

>>> s = set([1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> s.remove(5)
>>> print s
set([1, 2, 3, 4, 6, 7, 8, 9])
>>> print s.remove(4)
None
>>> print s
set([1, 2, 3, 6, 7, 8, 9])
>>> s.remove(0)
KeyError: 0


This operation also removes element x from the set.
If element x does not exist, it does not raise a KeyError.
The .discard(x) operation returns None.

Example

>>> s = set([1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> print s
set([1, 2, 3, 4, 6, 7, 8, 9])
None
>>> print s
set([1, 2, 3, 6, 7, 8, 9])
>>> print s
set([1, 2, 3, 6, 7, 8, 9])


.pop()

This operation removes and return an arbitrary element from the set.
If there are no elements to remove, it raises a KeyError.

Example

>>> s = set()
>>> print s.pop()
1
>>> print s
set([])
>>> print s.pop()
KeyError: pop from an empty set


You have a non-empty set s and you have to execute N commands given in N lines.

The commands will be pop, remove and discard.

Input Format

The first line contains integer N, the number of elements in the set s.

The second line contains n space separated elements of set s. All of the elements are non-negative integers, less than or equal to 9.
The third line contains integer N, the number of commands.
The next N ines contains either pop, remove and/or discard commands followed by their associated value.

Constraints

0 < n < 20

0 < N < 20

Output Format

Print the sum of the elements of set s on a single line.

Sample Input

9
1 2 3 4 5 6 7 8 9
10
pop
remove 9
remove 7
pop
remove 5
pop


Sample Output

4


Explanation

After completing these 10 operations on the set, we get set (|4|). Hence, the sum is 4.

Note: Convert the elements of set s to integers while you are assigning them. To ensure the proper input of the set, we have added the first two lines of code to the editor.

## Code Examples

### #1 Code Example with Python Programming

Code - Python Programming


n = int(input())
s = set(map(int, input().split()))

for _ in range(int(input())):
name, *args = input().split()
getattr(s, name)(*map(int, args))

print(sum(s))

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