Buggy python submission (verdict: Time Limit Exceeded):
#dpでできないかな？
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)
from collections import Counter, deque
from collections import defaultdict
from itertools import combinations, permutations, accumulate, groupby, product
from bisect import bisect_left,bisect_right
from heapq import heapify, heappop, heappush
from math import floor, ceil,pi
from operator import itemgetter
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
def LI2(): return [int(input()) for i in range(n)]
def MXI(): return [[LI()]for i in range(n)]
def SI(): return input().rstrip()
def printns(x): print('\n'.join(x))
def printni(x): print('\n'.join(list(map(str,x))))
inf = 10**17
#mod = 10**9 + 7

mod=2019
l,r=MI()
mn=inf
mods=[]

#print(mods)
if l-r>=2018:
    ans=0
else:
    for i in range(l,r+1):
        mods.append(i%mod)
    for i in range(r-l+1):
        for j in range(i+1,r-l+1):
            u=(mods[i])*(mods[j])%mod
            if u<mn:
                mn=u
    ans=mn
print(ans)

Fixed submission:
import sys
input = sys.stdin.readline
import math

def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

l,r=MI()
mod=[]
if r-l>=2019:
    rm=0
    print(rm)
    sys.exit()
else:
    for i in range(l,r+1):
        mod.append(i%2019)
#print(mod)
mn=10**7
for i in range(len(mod)-1):
    for j in range(i+1,len(mod)):
        #print(mod[i],end=" ")
        #print(mod[j])
        ans=(mod[i]*mod[j])%2019
        if ans<mn:
            mn=ans
print(mn)

Buggy python submission (verdict: Time Limit Exceeded):
#dpでできないかな？
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)
from collections import Counter, deque
from collections import defaultdict
from itertools import combinations, permutations, accumulate, groupby, product
from bisect import bisect_left,bisect_right
from heapq import heapify, heappop, heappush
from math import floor, ceil,pi
from operator import itemgetter
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
def LI2(): return [int(input()) for i in range(n)]
def MXI(): return [[LI()]for i in range(n)]
def SI(): return input().rstrip()
def printns(x): print('\n'.join(x))
def printni(x): print('\n'.join(list(map(str,x))))
inf = 10**17
#mod = 10**9 + 7

mod=2019
l,r=MI()
mn=inf
mods=[]
for i in range(l,r+1):
    mods.append(i%mod)
#print(mods)
if l-r>=2019:
    ans=0
else:
    for i in range(r-l+1):
        for j in range(i+1,r-l+1):
            u=(mods[i])*(mods[j])%mod
            if u<mn:
                mn=u
    ans=mn
print(ans)

Fixed submission:
import sys
input = sys.stdin.readline
import math

def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

l,r=MI()
mod=[]
if r-l>=2019:
    rm=0
    print(rm)
    sys.exit()
else:
    for i in range(l,r+1):
        mod.append(i%2019)
#print(mod)
mn=10**7
for i in range(len(mod)-1):
    for j in range(i+1,len(mod)):
        #print(mod[i],end=" ")
        #print(mod[j])
        ans=(mod[i]*mod[j])%2019
        if ans<mn:
            mn=ans
print(mn)

Buggy python submission (verdict: Time Limit Exceeded):
#dpでできないかな？
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)
from collections import Counter, deque
from collections import defaultdict
from itertools import combinations, permutations, accumulate, groupby, product
from bisect import bisect_left,bisect_right
from heapq import heapify, heappop, heappush
from math import floor, ceil,pi
from operator import itemgetter
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
def LI2(): return [int(input()) for i in range(n)]
def MXI(): return [[LI()]for i in range(n)]
def SI(): return input().rstrip()
def printns(x): print('\n'.join(x))
def printni(x): print('\n'.join(list(map(str,x))))
inf = 10**17
#mod = 10**9 + 7

mod=2019
l,r=MI()
mn=inf
mods=[]
for i in range(l,r+1):
    mods.append(i%mod)
#print(mods)
if l-r>=2019:
    ans=0
else:
    for i in range(r-l+1):
        for j in range(i+1,r-l+1):
            u=(mods[i])*(mods[j])%mod
            if u<mn:
                mn=u
    ans=mn
print(ans)

Fixed submission:
import sys
input = sys.stdin.readline
import math

def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

l,r=MI()
mod=[]
if r-l>=2019:
    rm=0
    print(rm)
    sys.exit()
else:
    for i in range(l,r+1):
        mod.append(i%2019)
#print(mod)
mn=10**7
for i in range(len(mod)-1):
    for j in range(i+1,len(mod)):
        #print(mod[i],end=" ")
        #print(mod[j])
        ans=(mod[i]*mod[j])%2019
        if ans<mn:
            mn=ans
print(mn)