.remove(x)

This operation removes element $\boldsymbol{x}$ from the set.

If element $\boldsymbol{x}$ 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

.discard(x)

This operation also removes element $\boldsymbol{x}$ from the set.

If element $\boldsymbol{x}$ 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])
s.discard(5)
print s
set([1, 2, 3, 4, 6, 7, 8, 9])
print s.discard(4)
None
print s
set([1, 2, 3, 6, 7, 8, 9])
s.discard(0)
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([1])
print s.pop()
1
print s
set([])
print s.pop()
KeyError: pop from an empty set

Task

You have a non-empty set $\boldsymbol{\mathrm{~S~}}$, 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 $\boldsymbol{\mathrm{~S~}}$.

The second line contains $n$ space separated elements of set $\boldsymbol{\mathrm{~S~}}$. 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 $N$ lines contains either pop, remove and/or discard commands followed by their associated value.

Constraints

$0<n<20$

$\boldsymbol{0<N<20}$

Output Format

Print the sum of the elements of set $\boldsymbol{\mathrm{~S~}}$ on a single line.

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

Sample Output
4

Explanation

After completing these $10$ operations on the set, we get set$\left([4]\right)$. Hence, the sum is $\begin{array}{c}4\end{array}$.

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.

见题面

见题面