Help me in solving MISSP problem

help
,
1

My issue

My code

#import re
for i in range(int(input())):
    N = int(input())
    y = []
    for iterator in range(N):
        y.append(int(input()))
    for iterator in y:
        if(y.count(iterator)%2 == 1):
            print(iterator)
        
    #print(y)

Problem Link: MISSP Problem - CodeChef