using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var a=sc.Ia3(0);
		var b=sc.Ia3(0);
		var dp=new Modint[s[0]+1][];
		dp[0]=new Modint[s[1]+1];
		for(int i = 0;i<=s[1];i++) {dp[0][i]=1;}
		for(int i = 1;i<=s[0];i++) {
			dp[i]=new Modint[s[1]+1];
			dp[i][0]=1;
			for(int j = 1;j<=s[1];j++) {
				dp[i][j]=dp[i-1][j]+dp[i][j-1];
				if(a[i]!=b[j]){dp[i][j]-=dp[i-1][j-1];}
			}
		}
		Console.WriteLine("{0}",dp[s[0]][s[1]]);
	}
}

public struct Modint{
	const int mod=(int)1e9+7;
	private long d;
	public Modint(long d){this.d=d;}
	public static implicit operator Modint(long d){return new Modint(d);}
	public static explicit operator long(Modint d){return d.d;}
	public override string ToString(){return d.ToString();}
	public static Modint operator+(Modint a,long b){a.d=(a.d+b)%mod;return a;}
	public static Modint operator+(Modint a,Modint b){a.d=(a.d+b.d)%mod;return a;}
	public static Modint operator-(Modint a,long b){a.d=(mod+a.d-b)%mod;return a;}
	public static Modint operator-(Modint a,Modint b){a.d=(mod+a.d-b.d)%mod;return a;}
	public static Modint operator*(Modint a,long b){a.d=(a.d*b)%mod;return a;}
	public static Modint operator*(Modint a,Modint b){a.d=(a.d*b.d)%mod;return a;}
	public static Modint operator/(Modint a,long b){a.d=(a.d*Mi(b))%mod;return a;}
	public static Modint operator/(Modint a,Modint b){a.d=(a.d*Mi(b.d))%mod;return a;}
	private static long Mi(long a){
		a=(a+mod)%mod;
		long b=mod,u=1,v=0;
		while(b>0){
			long t=a/b;
			a-=t*b;a^=b;b^=a;a^=b;
			u-=t*v;u^=v;v^=u;u^=v;
		}
		u%=mod;
		if(u<0){u+=mod;}
		return u%mod;
	}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}


Measured memory_bytes: 44888