Buggy python submission (verdict: Time Limit Exceeded):
import sys
def I(): return int(input())  # '123' -> 123
def Is(): return map(int, input().split())  # '123 456' -> 123, 456
def LI(): return list(map(int, input().split()))  # '123 456' -> [123, 456]
def TI(): return tuple(map(int, input().split()))  # '123 456' -> (123, 456)
def IR(n): return [I() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def TIR(n): return [TI() for _ in range(n)]
def S(): return input()
def Ss(): return input().split()  # 'aa bb' -> 'aa','bb' or ['aa','bb']
def LS(): return list(input())  # 'abc123' -> ['a','b','c','1','2','3']
def SR(n): return [S() for _ in range(n)]
def SsR(n): return [Ss() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
sys.setrecursionlimit(1000000)
MOD = 1000000007
INF = float('inf')

s = S()
q = I()
flag = 0

for i in range(q):
    query = input()
    if query[0] == '1':
        flag = flag ^ 1  # flagを反転
    else:
        if (query[2] == '1' and not flag) or (query[2] == '2' and flag):
            s = query[4] + s
        else:
            s = s + query[4]

if not flag:
    print(s)
else:
    print(s[::-1])


Fixed submission:
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop
from itertools import permutations, accumulate
from math import sqrt, ceil, floor, factorial
from bisect import bisect_left, bisect_right
from copy import deepcopy
from operator import itemgetter
from fractions import gcd
import sys
def I(): return int(input())  # '123' -> 123
def Is(): return map(int, input().split())  # '123 456' -> 123, 456
def LI(): return list(map(int, input().split()))  # '123 456' -> [123, 456]
def TI(): return tuple(map(int, input().split()))  # '123 456' -> (123, 456)
def IR(n): return [I() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def TIR(n): return [TI() for _ in range(n)]
def S(): return input()
def Ss(): return input().split()  # 'aa bb' -> 'aa','bb' or ['aa','bb']
def LS(): return list(input())  # 'abc123' -> ['a','b','c','1','2','3']
def SR(n): return [S() for _ in range(n)]
def SsR(n): return [Ss() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
sys.setrecursionlimit(1000000)
MOD = 1000000007
INF = float('inf')

s = S()
q = I()
flag = 0
ans = deque(s)

for i in range(q):
    query = input()
    if query[0] == '1':
        flag = flag ^ 1  # flagを反転
    else:
        if (query[2] == '1' and not flag) or (query[2] == '2' and flag):
            ans.appendleft(query[4])
        else:
            ans.append(query[4])

if not flag:
    print("".join(ans))
else:
    print("".join(reversed(ans)))

Buggy python submission (verdict: Time Limit Exceeded):
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop
from itertools import permutations, accumulate
from math import sqrt, ceil, floor, factorial
from bisect import bisect_left, bisect_right
from copy import deepcopy
from operator import itemgetter
from fractions import gcd
import sys
def I(): return int(input())  # '123' -> 123
def Is(): return map(int, input().split())  # '123 456' -> 123, 456
def LI(): return list(map(int, input().split()))  # '123 456' -> [123, 456]
def TI(): return tuple(map(int, input().split()))  # '123 456' -> (123, 456)
def IR(n): return [I() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def TIR(n): return [TI() for _ in range(n)]
def S(): return input()
def Ss(): return input().split()  # 'aa bb' -> 'aa','bb' or ['aa','bb']
def LS(): return list(input())  # 'abc123' -> ['a','b','c','1','2','3']
def SR(n): return [S() for _ in range(n)]
def SsR(n): return [Ss() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
sys.setrecursionlimit(1000000)
MOD = 1000000007
INF = float('inf')

s = S()
q = I()
Q = SsR(q)
flag = 0

# print(Q)

for x in Q:
    tmp = ""
    if x[0] == '1':
        flag = flag ^ 1  # flagを反転
    else:
        if (x[1] == '1' and not flag) or (x[1] == '2' and flag):
            tmp = x[2] + s
        else:
            tmp = s + x[2]
        s = tmp

if not flag:
    print(s)
else:
    print(s[::-1])


Fixed submission:
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop
from itertools import permutations, accumulate
from math import sqrt, ceil, floor, factorial
from bisect import bisect_left, bisect_right
from copy import deepcopy
from operator import itemgetter
from fractions import gcd
import sys
def I(): return int(input())  # '123' -> 123
def Is(): return map(int, input().split())  # '123 456' -> 123, 456
def LI(): return list(map(int, input().split()))  # '123 456' -> [123, 456]
def TI(): return tuple(map(int, input().split()))  # '123 456' -> (123, 456)
def IR(n): return [I() for _ in range(n)]
def LIR(n): return [LI() for _ in range(n)]
def TIR(n): return [TI() for _ in range(n)]
def S(): return input()
def Ss(): return input().split()  # 'aa bb' -> 'aa','bb' or ['aa','bb']
def LS(): return list(input())  # 'abc123' -> ['a','b','c','1','2','3']
def SR(n): return [S() for _ in range(n)]
def SsR(n): return [Ss() for _ in range(n)]
def LSR(n): return [LS() for _ in range(n)]
sys.setrecursionlimit(1000000)
MOD = 1000000007
INF = float('inf')

s = S()
q = I()
flag = 0
ans = deque(s)

for i in range(q):
    query = input()
    if query[0] == '1':
        flag = flag ^ 1  # flagを反転
    else:
        if (query[2] == '1' and not flag) or (query[2] == '2' and flag):
            ans.appendleft(query[4])
        else:
            ans.append(query[4])

if not flag:
    print("".join(ans))
else:
    print("".join(reversed(ans)))