MOD = 10 ** 9 + 7
n, m = map(int, input().split())
s = list(map(int, input().split()))
t = list(map(int, input().split()))
dp = [[0] * (m + 3) for _ in range(n + 3)]
for i in range(n + 3):
    dp[i][0] = 1
for i in range(m + 3):
    dp[0][i] = 1
for i in range(1, n + 1):
    for j in range(1, m + 1):
        if s[i - 1] == t[j - 1]:
            dp[i][j] += dp[i - 1][j] + dp[i][j - 1]
        else:
            dp[i][j] += dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1]
        dp[i][j] %= MOD
print(dp[n][m] % MOD)