Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2019
s[0]=1
for j in range(1,n+1):
    m=T(j)%2019
    s[m]+=1

c=0

for m in s:
    c += m*(m-1)/2

print(int(c))

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2019
for j in range(1,n+1):
    print(T(j))
    m=T(j)%2019
    s[m]+=1

c=s[0]

for m in s:
    c += m*(m-1)/2

print(int(c))


Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2018
for j in range(1,n+1):
    print(T(j))
    m=T(j)%2019
    s[m]+=1

c=s[0]

for m in s:
    c += m*(m-1)/2

print(int(c))

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2018
for j in range(1,n+1):
    print(T(j))
    m=T(j)%2019
    s[m]+=1

c=s[0]

for m in s:
    c += m*(m-1)/2

print(int(c))

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2019
for j in range(1,n+1):
    m=T(j)%2019
    s[m]+=1

c=s[0]

for m in s:
    c += m*(m-1)/2

print(int(c))

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Runtime Error):
S=input()
n=len(S)
def T(i):
    if i == 0:
        return 0
    else:
        i-=1
        return T(i)+(10**i)*int(S[n-1-i])
s=[0]*2019
for j in range(1,n+1):

    m=T(j)%2019

    s[m]+=1

c=s[0]

for m in s:
    c += m*(m-1)/2

print(int(c))

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
S=input()
n=len(S)

c=0
for i in range(4,n+1):
    for j in range(n-i+1):
        if int(S[j:j+i])%2019==0:
            c+=1
print(c)

Fixed submission:
s = input()
p = 2019
n = 0
ans = 0
mods = [0]*p
mods[0] = 1
for i, j in enumerate(reversed(s)):
  n += int(j)*pow(10, i, p)
  n %= p
  mods[n] += 1
for i in mods:
  ans += i*(i-1)//2
print(ans)