mod = 1000000007
eps = 10**-9


def main():
    import sys
    from collections import deque
    input = sys.stdin.readline

    A = deque()
    N = int(input())
    for _ in range(N):
        t, s = input().split()
        if t == "0":
            A.append(s)
        else:
            A.appendleft(s)
    print("".join(A))


if __name__ == '__main__':
    main()