#include<bits/stdc++.h>
using namespace std;
long long a[10000000],b[1000000],n,x,nnn;
int main(){
    cin >> n >> x;
    for(int i=0; i<n; i++){
        cin >> a[i];
    }
    for(int i=0; i<x; i++){
        int l=0,r=n-1,mid=0,ans;
        bool f=0;
        cin >> ans;
        while(l<=r){
            mid=(l+r)/2;
            
            if(a[mid]==ans){
                
                f=1;
                r=mid-1;
                nnn=mid;
            }
            if(a[mid]<ans) l=mid+1;
            else r=mid-1;
        }

        if(f==0) cout << -1 << "\n";
        else cout << nnn+1 << "\n";
    }
    return 0;
}