#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<future>
#include<cstring>
using namespace std;
int a[1000010];
inline int read(){
    int x=1,y=0;
    char ch=getchar();
    while(ch<'0'||ch>'9'){
        if(ch=='-')x=-1;
        ch=getchar();
    }
    while(ch>='0'&&ch<='9'){
        y=y*10+ch-'0';
        ch=getchar();
    }
    return x*y;
}
inline void write(int n){
    if(n<0)putchar('-'),n=-n;
    if(n>9)write(n/10);
    putchar(n%10+'0');
}
int binarySearch(const vector<int>&arr,int target){
    int pos = upper_bound(a,a+arr.size(),target)-a;
    if (a[pos-1]==target)return pos;
    else return -1;
}
void asyncRead(vector<int>&arr,int n){
    for(int i=0;i<n;++i)
    arr[i]=read();
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n=read(),m=read();
    vector<int>arr(n);
    asyncRead(arr,n);
    sort(arr.begin(),arr.end());
    for(int i=0;i<arr.size();i++){
        a[i]=arr[i];
    }
    while(m--){
        int q=read();
        int result=binarySearch(arr,q);
        write(result);putchar('\n');
    }
    return 0;
}