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+1) for i in range(N+1)]
dp[0][0] = 1
for i in range(N+1):
    for j in range(M+1):
        if i-1 >= 0 and j-1>=0 and S[i-1] == T[j-1]:
            dp[i][j] += dp[i-1][j-1]
        if i-1 >= 0:
            dp[i][j] += dp[i-1][j]
        if j-1>= 0:
            dp[i][j] += dp[i][j-1]
        if i-1 >= 0 and j-1>=0:
            dp[i][j] -= dp[i-1][j-1]
        dp[i][j] %= MOD
print(dp[N][M]%MOD)
