#include "bits/stdc++.h"
using namespace std;

int main() {
	int N, M, S[2000], T[2000], MOD = 1000000007;
	static long long DP[2010][2010] = {};
	cin >> N >> M;
	for (int i = 0; i < N; i++) cin >> S[i];
	for (int i = 0; i < M; i++) cin >> T[i];
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < M; j++) {
			if (S[i] == T[j]) {
				DP[i + 1][j + 1] = DP[i + 1][j] + DP[i][j + 1] + 1;
			}
			else {
				DP[i + 1][j + 1] = DP[i + 1][j] + DP[i][j + 1] - DP[i][j];
			}
			DP[i + 1][j + 1] = (DP[i + 1][j + 1] + MOD) % MOD;
		}
	}
	cout << (DP[N][M] + 1 + MOD) % MOD;
}