T = int(input())
for __ in range(T):
dictionary = {}
maxA = 0
numSchool = int(input())
for i in range(numSchool):
a, b = input().split()
dictionary[int(b)] = a
for j in dictionary.keys():
if maxA<j :
maxA = j
print(dictionary[maxA])
딕셔너리 = key : value 를 활용했다.