Buggy python submission (verdict: Runtime Error):
#from statistics import median
#import collections
#aa = collections.Counter(a) # list to list || .most_common(2)で最大の2個とりだせるお a[0][0]
from fractions import gcd
from itertools import combinations,permutations,accumulate, product # (string,3) 3回
#from collections import deque
from collections import deque,defaultdict,Counter
import decimal
import re
import math
import bisect
#
#
#
# pythonで無理なときは、pypyでやると正解するかも！！
#
#
# my_round_int = lambda x:np.round((x*2 + 1)//2)
# 四捨五入g
#
# インデックス系
# int min_y = max(0, i - 2), max_y = min(h - 1, i + 2);
# int min_x = max(0, j - 2), max_x = min(w - 1, j + 2);
#
#
import sys
sys.setrecursionlimit(10000000)
mod = 10**9 + 7
#mod = 9982443453
#mod = 998244353
from sys import stdin
readline = stdin.readline
def readInts():
  return list(map(int,readline().split()))
def readTuples():
    return tuple(map(int,readline().split()))
def I():
  return int(readline())
s = input()
q = I()
straight = True
ans = deque(s)
for i in range(q):
    A = input().split()
    if A[0] == '1':
        straight = not straight
    else:
        if straight:
            if A[1] == '1':
                ans.append(A[2])
            else:
                ans.appendleft(A[2])
        else:
            if A[1] == '1':
                ans.appendleft(A[2])
            else:
                ans.append(A[2])
if straight:
    print(*ans,sep='')
else:
    print(*an[::-1],sep='')


Fixed submission:
from collections import deque
d = deque([])
ans = input()
d.append(ans)
q = int(input())
rev = True # Trueなら後ろに # Falseなら前に
for i in range(q):
    Query = list(map(str,input().split()))
    if Query[0] == '2':
        if Query[1] == '1':
            if rev:
                d.append(Query[2])
            else:
                d.appendleft(Query[2])
        elif Query[1] == '2':
            if rev:
                d.appendleft(Query[2])
            else:
                d.append(Query[2])
    else:
        rev = rev^True
output = ""
while d:
    output += d.pop()
if rev:
    print(output)
else:
    print(output[::-1])

Buggy python submission (verdict: Time Limit Exceeded):
#from statistics import median
#import collections
#aa = collections.Counter(a) # list to list || .most_common(2)で最大の2個とりだせるお a[0][0]
from fractions import gcd
from itertools import combinations,permutations,accumulate, product # (string,3) 3回
#from collections import deque
from collections import deque,defaultdict,Counter
import decimal
import re
import math
import bisect
#
#
#
# pythonで無理なときは、pypyでやると正解するかも！！
#
#
# my_round_int = lambda x:np.round((x*2 + 1)//2)
# 四捨五入g
#
# インデックス系
# int min_y = max(0, i - 2), max_y = min(h - 1, i + 2);
# int min_x = max(0, j - 2), max_x = min(w - 1, j + 2);
#
#
import sys
sys.setrecursionlimit(10000000)
mod = 10**9 + 7
#mod = 9982443453
#mod = 998244353
from sys import stdin
readline = stdin.readline
def readInts():
  return list(map(int,readline().split()))
def readTuples():
    return tuple(map(int,readline().split()))
def I():
  return int(readline())
s = input()
q = I()
straight = True
for i in range(q):
    A = input().split()
    if A[0] == '1':
        straight = not straight
    else:
        if straight:
            if A[1] == '1':
                s = A[2] + s
            else:
                s = s + A[2]
        else:
            if A[1] == '1':
                s = s + A[2]
            else:
                s = A[2] + s
if straight:
    print(''.join(s))
else:
    print(''.join(s[::-1]))


Fixed submission:
from collections import deque
d = deque([])
ans = input()
d.append(ans)
q = int(input())
rev = True # Trueなら後ろに # Falseなら前に
for i in range(q):
    Query = list(map(str,input().split()))
    if Query[0] == '2':
        if Query[1] == '1':
            if rev:
                d.append(Query[2])
            else:
                d.appendleft(Query[2])
        elif Query[1] == '2':
            if rev:
                d.appendleft(Query[2])
            else:
                d.append(Query[2])
    else:
        rev = rev^True
output = ""
while d:
    output += d.pop()
if rev:
    print(output)
else:
    print(output[::-1])

Buggy python submission (verdict: Time Limit Exceeded):
ans = input()
q = int(input())
for i in range(q):
    #print(ans)
    Query = list(map(str,input().split()))
    #print(Query)
    if Query[0] == '2':
        if Query[1] == '1':
            ans = Query[2] + ans
        elif Query[1] == '2':
            ans += Query[2]
    else:
        ans = ans[::-1]
print(ans)


Fixed submission:
from collections import deque
d = deque([])
ans = input()
d.append(ans)
q = int(input())
rev = True # Trueなら後ろに # Falseなら前に
for i in range(q):
    Query = list(map(str,input().split()))
    if Query[0] == '2':
        if Query[1] == '1':
            if rev:
                d.append(Query[2])
            else:
                d.appendleft(Query[2])
        elif Query[1] == '2':
            if rev:
                d.appendleft(Query[2])
            else:
                d.append(Query[2])
    else:
        rev = rev^True
output = ""
while d:
    output += d.pop()
if rev:
    print(output)
else:
    print(output[::-1])