#include <bits/stdc++.h>

using namespace std;

int n,m;
int a[1000010];

int f(int k)
{
    int l = 1, r = n;
    while(l < r)
    {
        int mid = (l + r) >> 1;
        if(a[mid] >= k) r = mid;
        else l = mid + 1;
    }
    if(a[l] == k) return l;
    return -1;
}

int main()
{
    scanf("%d%d",&n,&m);
    for(int i = 1;i <= n;i++) scanf("%d",&a[i]);
    while(m--)
    {
        int x;
        scanf("%d",&x);
        printf("%d ",f(x));
    }
    return 0;
}

请大佬指教一下