Why would this not work:

import sys

def solution(n, values, lines, N): for i in range(N): if lines[i][0] == "d": values.discard(int(lines[i][-1])) elif lines[i][0] == "r": values.remove(int(lines[i][-1])) else: values.pop()

return values

if name=="main": n = int(input()) values = set(map(int, input().split())) N = int(input())

lines = []
for _ in range(N):
    lines.append(input().strip())

result = solution(n, values, lines, N)
print(result)