自己看

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m;
ll a[1000010];
ll b[1000010];
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	std::cout.tie(nullptr);
	cin>>n>>m;
    for(ll i=1;i<=n;i++) cin>>a[i];
    while(m--){
        ll x;
        cin>>x;
        ll tar=lower_bound(a+1,a+1+n,x)-a;
        if(a[tar]==x){
            cout<<tar<<" ";
        }else{
            cout<<-1<<" ";
        }
    }
	//fclose(stdin);
	//fclose(stdout);
	return 0;
}
//coder::by::M91