from collections import deque


def main():
    n = int(input())

    dq = deque()
    for _ in range(n):
        t, s = input().split()
        if t == '0':
            dq.append(s)
        else:
            dq.appendleft(s)

    print(*dq, sep="")


if __name__ == "__main__":
    main()