N,M = map(int,input().split())
S = list(map(int,input().split()))
T = list(map(int,input().split()))
MOD = 10**9+7
dp = [[1 for i in range(N+2)] for j in range(M+2)]
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]
            dp[i][j] %= MOD
        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])
