Buggy python submission (verdict: Time Limit Exceeded):
import sys
F = sys.stdin
S = list(map(int, list(F.readline().replace("A", "1").replace("B", "2").strip("\n"))))
T = list(map(int, list(F.readline().replace("A", "1").replace("B", "2").strip("\n"))))

sSum = [0] * (len(S)+1)
tSum = [0] * (len(T)+1)
for i in range(len(S)):
    sSum[i+1] = sSum[i] + S[i]
for i in range(len(T)):
    tSum[i+1] = tSum[i] + T[i]

Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if (sSum[b] - sSum[a-1]) % 3 == (tSum[d] - tSum[c-1]) % 3: Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Fixed submission:
import sys
F = sys.stdin
S = F.readline().replace("A", "1").replace("B", "2").strip("\n")
T = F.readline().replace("A", "1").replace("B", "2").strip("\n")

sSum = [0] * (len(S)+1)
tSum = [0] * (len(T)+1)
for i in range(len(S)):
    sSum[i+1] = sSum[i] + int(S[i])
for i in range(len(T)):
    tSum[i+1] = tSum[i] + int(T[i])

Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if (sSum[b] - sSum[a-1]) % 3 == (tSum[d] - tSum[c-1]) % 3: Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
F = sys.stdin
S = list(map(int, list(F.readline().replace("A", "1").replace("B", "2").strip("\n"))))
T = list(map(int, list(F.readline().replace("A", "1").replace("B", "2").strip("\n"))))

def initialize(L):
    d, length = 2, len(L)
    while d < length:
        d *= 2
    BT = [0] * (2 * d - 1)
    for i in range(length):
        K = d + i -1
        BT[d + i - 1] = L[i]
        while K > 0:
            K = (K - 1)//2
            BT[K] = (BT[2 * K + 1] + BT[2 * K + 2]) % 3
    return BT

def Search(i, j, l, r, level, BT):
    if r < i or j < l: return 0
    elif i <= l <= r <= j: return BT[level]
    else:
        sl = Search(i, j, l, (l+r)//2, 2*level+1, BT)
        sr = Search(i, j, (l+r)//2 + 1, r, 2*level+2, BT)
        return (sl + sr) % 3


ST, TT = initialize(S), initialize(T)
maxS, maxT = len(ST)//2, len(TT)//2
Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if Search(a-1, b-1, 0, maxS, 0, ST) == Search(c-1, d-1, 0, maxT, 0, TT): Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Fixed submission:
import sys
F = sys.stdin
S = F.readline().replace("A", "1").replace("B", "2").strip("\n")
T = F.readline().replace("A", "1").replace("B", "2").strip("\n")

sSum = [0] * (len(S)+1)
tSum = [0] * (len(T)+1)
for i in range(len(S)):
    sSum[i+1] = sSum[i] + int(S[i])
for i in range(len(T)):
    tSum[i+1] = tSum[i] + int(T[i])

Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if (sSum[b] - sSum[a-1]) % 3 == (tSum[d] - tSum[c-1]) % 3: Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
F = sys.stdin
S = F.readline().strip("\n")
T = F.readline().strip("\n")

def operate(i, j):
    group = {i, j}
    if group == {"A"}: return "B"
    elif group == {"B"}: return "A"
    elif group == {""}: return ""
    elif group == {"", "A"}: return "A"
    elif group == {"", "B"}: return "B"
    elif group == {"A", "B"}: return ""

def initialize(L):
    d, length = 2, len(L)
    while d < length:
        d *= 2
    BT = [""] * (2 * d - 1)
    for i in range(length):
        K = d + i -1
        BT[d + i - 1] = L[i]
        while K > 0:
            K = (K - 1)//2
            BT[K] = operate(BT[2 * K + 1], BT[2 * K + 2])
    return BT

def Search(i, j, l, r, level, BT):
    if r < i or j < l: return ""
    elif i <= l <= r <= j: return BT[level]
    else:
        sl = Search(i, j, l, (l+r)//2, 2*level+1, BT)
        sr = Search(i, j, (l+r)//2 + 1, r, 2*level+2, BT)
        ans = operate(sl, sr)
        return ans


ST, TT = initialize(S), initialize(T)
maxS, maxT = len(ST)//2, len(TT)//2
Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if Search(a-1, b-1, 0, maxS, 0, ST) == Search(c-1, d-1, 0, maxT, 0, TT): Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Fixed submission:
import sys
F = sys.stdin
S = F.readline().replace("A", "1").replace("B", "2").strip("\n")
T = F.readline().replace("A", "1").replace("B", "2").strip("\n")

sSum = [0] * (len(S)+1)
tSum = [0] * (len(T)+1)
for i in range(len(S)):
    sSum[i+1] = sSum[i] + int(S[i])
for i in range(len(T)):
    tSum[i+1] = tSum[i] + int(T[i])

Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if (sSum[b] - sSum[a-1]) % 3 == (tSum[d] - tSum[c-1]) % 3: Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)
S = input()
T = input()


def operate(i, j):
    group = {i, j}
    if group == {"A"}: return "B"
    elif group == {"B"}: return "A"
    elif group == {""}: return ""
    elif group == {"", "A"}: return "A"
    elif group == {"", "B"}: return "B"
    elif group == {"A", "B"}: return ""

def initialize(L):
    d, length = 2, len(L)
    while d < length:
        d *= 2
    BT = [""] * (2 * d - 1)
    for i in range(length):
        K = d + i -1
        BT[d + i - 1] = L[i]
        while K > 0:
            K = (K - 1)//2
            BT[K] = operate(BT[2 * K + 1], BT[2 * K + 2])
    return BT

def Search(i, j, l, r, level, BT):
    if r < i or j < l: return ""
    elif i <= l <= r <= j: return BT[level]
    else:
        sl = Search(i, j, l, (l+r)//2, 2*level+1, BT)
        sr = Search(i, j, (l+r)//2 + 1, r, 2*level+2, BT)
        ans = operate(sl, sr)
        return ans


ST, TT = initialize(S), initialize(T)
maxS, maxT = len(ST)//2, len(TT)//2
Q = int(input())
for _ in range(Q):
    a, b, c, d = map(int, input().split())
    if Search(a-1, b-1, 0, maxS, 0, ST) == Search(c-1, d-1, 0, maxT, 0, TT): print("YES")
    else: print("NO")

Fixed submission:
import sys
F = sys.stdin
S = F.readline().replace("A", "1").replace("B", "2").strip("\n")
T = F.readline().replace("A", "1").replace("B", "2").strip("\n")

sSum = [0] * (len(S)+1)
tSum = [0] * (len(T)+1)
for i in range(len(S)):
    sSum[i+1] = sSum[i] + int(S[i])
for i in range(len(T)):
    tSum[i+1] = tSum[i] + int(T[i])

Ans = ""
Q = int(F.readline().strip("\n"))
for _ in range(Q):
    a, b, c, d = map(int, F.readline().strip("\n").split(" "))
    if (sSum[b] - sSum[a-1]) % 3 == (tSum[d] - tSum[c-1]) % 3: Ans += "YES\n"
    else: Ans += "NO\n"
print(Ans)