Buggy python submission (verdict: Time Limit Exceeded):
s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

def to_one(word):


    word = word.replace('AAA', '')
    word = word.replace('BBB', '')

    word = word.replace('AB', '')
    word = word.replace('BA', '')

    word = word.replace('AA', 'B')
    word = word.replace('BB', 'A')

    word = word.replace('AAA', '')
    word = word.replace('BBB', '')

    word = word.replace('AB', '')
    word = word.replace('BA', '')

    if len(word)==0:
            return 'C'

    if len(word)==1:
        return word


for a,b,c,d in abcd:

    s_i = s[a-1:b]
    t_i = t[c-1:d]

    if to_one(s_i) == to_one(t_i):
        print('YES')
    else:
        print('NO')



Fixed submission:
from itertools import accumulate

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

s_number = [2 if ab == 'B' else 1 for ab in s]
t_number = [2 if ab == 'B' else 1 for ab in t]

s_sum = [0] + s_number
s_sum = list(accumulate(s_sum))

t_sum = [0] + t_number
t_sum = list(accumulate(t_sum))

for a,b,c,d in abcd:

    s_i = s_sum[b]-s_sum[a-1]
    t_i = t_sum[d]-t_sum[c-1]

    if s_i%3 == t_i%3:
        print('YES')
    else:
        print('NO')

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10 ** 7)

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

def to_one(word):
    if len(word)==0:
        return 'C'

    if len(word)==1:
        return word

    word = word.replace('AAA', '')
    word = word.replace('BBB', '')

    word = word.replace('AB', '')
    word = word.replace('BA', '')

    word = word.replace('AA', 'B')
    word = word.replace('BB', 'A')

    return to_one(word)


for a,b,c,d in abcd:

    s_i = s[a-1:b]
    t_i = t[c-1:d]

    if to_one(s_i) == to_one(t_i):
        print('YES')
    else:
        print('NO')



Fixed submission:
from itertools import accumulate

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

s_number = [2 if ab == 'B' else 1 for ab in s]
t_number = [2 if ab == 'B' else 1 for ab in t]

s_sum = [0] + s_number
s_sum = list(accumulate(s_sum))

t_sum = [0] + t_number
t_sum = list(accumulate(t_sum))

for a,b,c,d in abcd:

    s_i = s_sum[b]-s_sum[a-1]
    t_i = t_sum[d]-t_sum[c-1]

    if s_i%3 == t_i%3:
        print('YES')
    else:
        print('NO')

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10 ** 7)

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

def to_one(word):
    if len(word)==0:
        return 0

    if len(word)==1:
        return word

    if word[:2] == 'AB' or word[:2] == 'BA':
        return to_one(word[2:])

    if word[:3] == 'AAA':
        return to_one(word[3:])

    if word[:3] == 'BBB':
        return to_one(word[3:])

    if word[:2] == 'AA':
        return to_one('B'+word[2:])
    if word[:2] == 'BB':
        return to_one('A'+word[2:])


for a,b,c,d in abcd:

    s_i = s[a-1:b]
    t_i = t[c-1:d]

    if to_one(s_i) == to_one(t_i):
        print('YES')
    else:
        print('NO')


Fixed submission:
from itertools import accumulate

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

s_number = [2 if ab == 'B' else 1 for ab in s]
t_number = [2 if ab == 'B' else 1 for ab in t]

s_sum = [0] + s_number
s_sum = list(accumulate(s_sum))

t_sum = [0] + t_number
t_sum = list(accumulate(t_sum))

for a,b,c,d in abcd:

    s_i = s_sum[b]-s_sum[a-1]
    t_i = t_sum[d]-t_sum[c-1]

    if s_i%3 == t_i%3:
        print('YES')
    else:
        print('NO')

Buggy python submission (verdict: Runtime Error):
s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

def to_one(word):
    if len(word)==0:
        return 0

    if len(word)==1:
        return word

    if word[:2] == 'AB' or word[:2] == 'BA':
        return to_one(word[2:])

    if word[:3] == 'AAA':
        return to_one(word[3:])

    if word[:3] == 'BBB':
        return to_one(word[3:])

    if word[:2] == 'AA':
        return to_one('B'+word[2:])
    if word[:2] == 'BB':
        return to_one('A'+word[2:])


for a,b,c,d in abcd:

    s_i = s[a-1:b]
    t_i = t[c-1:d]

    if to_one(s_i) == to_one(t_i):
        print('YES')
    else:
        print('NO')



Fixed submission:
from itertools import accumulate

s = input()
t = input()
q = int(input())
abcd = [tuple(map(int,input().split())) for i in range(q)]

s_number = [2 if ab == 'B' else 1 for ab in s]
t_number = [2 if ab == 'B' else 1 for ab in t]

s_sum = [0] + s_number
s_sum = list(accumulate(s_sum))

t_sum = [0] + t_number
t_sum = list(accumulate(t_sum))

for a,b,c,d in abcd:

    s_i = s_sum[b]-s_sum[a-1]
    t_i = t_sum[d]-t_sum[c-1]

    if s_i%3 == t_i%3:
        print('YES')
    else:
        print('NO')