from collections import deque

sc = iter(open(0).read().split())
ni = lambda: int(next(sc))
ns = lambda: next(sc)

Q = deque()

N = ni()
for _ in range(N):
    s, c = ni(), ns()
    if s == 0:
        Q.append(c)
    else:
        Q.appendleft(c)

print("".join(map(str, Q)))