import sys, collections
 
sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
nsa = lambda: list(stdin.readline().split())
mod = 10 * 7 + 7

n = ni()
TS = [nsa() for _ in range(n)]
Ans = collections.deque()

for t, s in TS:
    if t == "0":
        Ans.append(s)
    else:
        Ans.appendleft(s)

print("".join(Ans))