Buggy python submission (verdict: Time Limit Exceeded):
def main():
    
    s = input()[::-1]
    mod = 10**9+7
    dp = [[0 for j in range(13)] for i in range(len(s)+1)]
    dp[0][0] = 1
    ten = 1


    for i in range(len(s)):
        if s[i] == "?":
            for k in range(10):
                x = k*ten%13
                for j in range(13):
                    dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod
        
        else:
            x = int(s[i])*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] += dp[i][j]%mod

        ten *= 10%mod

    print(dp[-1][5]%mod)

if __name__ == "__main__":
    main()

Fixed submission:
def main():
    
    s = input()[::-1]
    mod = 10**9+7
    dp = [[0 for j in range(13)] for i in range(len(s)+1)]
    dp[0][0] = 1
    ten = 1


    for i in range(len(s)):
        if s[i] == "?":
            for k in range(10):
                x = k*ten%13
                for j in range(13):
                    dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod
        
        else:
            x = int(s[i])*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod

        ten = (ten*10)%13

    print(dp[-1][5]%mod)

if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
def main():
    
    s = list(input())
    mod = 10**9+7
    dp = [[0]*13 for i in range(len(s)+1)]
    dp[0][0] = 1
    ten = 1


    for i in range(len(s)):
        if s[-1-i] == "?":
            for k in range(10):
                x = k*ten%13
                for j in range(13):
                    dp[i+1][(j+x)%13] += dp[i][j]
        
        else:
            x = int(s[-1-i])*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] += dp[i][j]%mod

        ten *= 10%mod

    print(dp[-1][5]%mod)

if __name__ == "__main__":
    main()

Fixed submission:
def main():
    
    s = input()[::-1]
    mod = 10**9+7
    dp = [[0 for j in range(13)] for i in range(len(s)+1)]
    dp[0][0] = 1
    ten = 1


    for i in range(len(s)):
        if s[i] == "?":
            for k in range(10):
                x = k*ten%13
                for j in range(13):
                    dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod
        
        else:
            x = int(s[i])*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod

        ten = (ten*10)%13

    print(dp[-1][5]%mod)

if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
s = list(input())
mod = 10**9+7
dp = [[0]*13 for i in range(len(s)+1)]
dp[0][0] = 1
ten = 1

s = s[::-1]
for i in range(len(s)):
    if s[i] == "?":
        for k in range(10):
            x = k*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] += dp[i][j]
    
    else:
        x = int(s[i])*ten%13
        for j in range(13):
            dp[i+1][(j+x)%13] += dp[i][j]%mod

    ten *= 10%mod

print(dp[-1][5]%mod)

Fixed submission:
def main():
    
    s = input()[::-1]
    mod = 10**9+7
    dp = [[0 for j in range(13)] for i in range(len(s)+1)]
    dp[0][0] = 1
    ten = 1


    for i in range(len(s)):
        if s[i] == "?":
            for k in range(10):
                x = k*ten%13
                for j in range(13):
                    dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod
        
        else:
            x = int(s[i])*ten%13
            for j in range(13):
                dp[i+1][(j+x)%13] = (dp[i][j]+dp[i+1][(j+x)%13])%mod

        ten = (ten*10)%13

    print(dp[-1][5]%mod)

if __name__ == "__main__":
    main()