import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from collections import deque

q = deque()
N = int(readline())
for query in readlines():
    if query.startswith(b'0'):
        f = q.append
    else:
        f = q.appendleft
    s = query.split()[1]
    f(s)

word = b''.join(q).decode()
print(word)