#!/usr/bin/env python3


import collections


def compute(entries):
    q = collections.deque()
    for t, s in entries:
        if t == 0:
            q.append(s)
        else:
            q.appendleft(s)
    return "".join(q)


def main():
    n = int(input())
    entries = []
    for _ in range(n):
        t0, s = input().split()
        entries.append((int(t0), s))
    res = compute(entries)
    print(res)


if __name__ == "__main__":
    main()