import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
import collections
D=collections.deque()
f1=D.append
f2=D.appendleft
for _ in range(n):
  t,s=input().split()
  if t=="0":
    f1(s)
  else:
    f2(s)
print("".join(D))