#!/usr/bin/env python3
from collections import deque
import sys

def main():
    N = int(input())
    q = deque()
    for _ in range(N):
        T, S = input().split()
        if T == "0":
            q.append(S)
        else:
            q.appendleft(S)
    print(*q, sep="")
    return

if __name__ == '__main__':
    main()