cou=int(input())
areas=[]
foods=[]
for i in range(cou):
area, food=input().split()
areas.append(area)
foods.append(food)
last=input()
g=0
for i in range(cou):
if last == areas[i]:
print(foods[i])
g=1
if g==0:
print("error")

시간 초과도 아니고 왜 안되는걸까요