N, M = map(int, input().split())
S = list(map(int, input().split()))
T = list(map(int, input().split()))
mod = 10**9+7

dp = [[0 for _ in range(M+1)] for _ in range(N+1)]
for i in range(N+1):
    dp[i][0] = 1
for j in range(M+1):
    dp[0][j] = 1
for i in range(N):
    for j in range(M):
        flg = 0 if S[i] == T[j] else 1
        dp[i+1][j+1] = (dp[i+1][j] + dp[i][j+1] - dp[i][j] * flg)%mod

print(dp[-1][-1])
