Buggy python submission (verdict: Runtime Error):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Runtime Error):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Runtime Error):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Runtime Error):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================

Buggy python submission (verdict: Runtime Error):
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(n+2) for i in range(m+2)]
    sdp = [[0]*(n+2) for i in range(m+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]
            sdp[i+1][j+1] = sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j]

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================
    

Fixed submission:
import itertools
from collections import deque,defaultdict,Counter
from itertools import accumulate
import bisect
from heapq import heappop,heappush,heapify
from fractions import gcd
from copy import deepcopy
import math
import queue
#import numpy as np
#import sympy as syp(素因数分解とか)
Mod = 1000000007
import sys
sys.setrecursionlimit(1000000) 
  
def sieve_of_eratosthenes(n):
    if not isinstance(n,int):
        raise TypeError("n is not int")
    if n<2:
        raise ValueError("n is not effective")
    prime = [1]*(n+1)
    for i in range(2,int(math.sqrt(n))+1):
        if prime[i] == 1:
            for j in range(2*i,n+1):
                if j%i == 0:
                    prime[j] = 0
    res = []
    for i in range(2,n+1):
        if prime[i] == 1:
            res.append(i)
    return res

def factorial(i):
    if i == 1:
        return 1
    else:
        return i*factorial(i-1)
 
class UnionFind:
    def __init__(self,n):
        self.parent = [i for i in range(n+1)]
        self.rank = [0 for i in range(n+1)]
    
    def findroot(self,x):
        if x == self.parent[x]:
            return x
        else:
            y = self.parent[x]
            y = self.findroot(self.parent[x])
            return y
    
    def union(self,x,y):
        px = self.findroot(x)
        py = self.findroot(y)
        if px < py:
            self.parent[py] = px
        else:
            self.parent[px] = py
 
    def same_group_or_no(self,x,y):
        return self.findroot(x) == self.findroot(y)




def main(): #startline--------------------------------------------
    n,m = map(int,input().split())
    s = list(map(int,input().split()))
    t = list(map(int,input().split()))
    dp = [[0]*(m+2) for i in range(n+2)]
    sdp = [[0]*(m+2) for i in range(n+2)]
    dp[0][0] = 1
    sdp[1][1] = 1
    for i in range(n+1):
        for j in range(m+1):
            if i == 0 and j == 0:continue
            if i>=1 and j >= 1 and s[i-1] == t[j-1]:
                dp[i][j] = sdp[i][j]%Mod
            sdp[i+1][j+1] = (sdp[i+1][j] + sdp[i][j+1] - sdp[i][j] + dp[i][j])%Mod

    print(sdp[n+1][m+1]%Mod)

if __name__ == "__main__":
    main() 
    
#endline===============================================