#include <iostream>
using namespace std;
int main(){
    int a,b,c[1000005],d[100004],m=0;
    cin>>a>>b;
    for(int i=1;i<=a;i++)
        scanf("%d",&c[i]);
    for(int i=1;i<=b;i++)
        scanf("%d",&d[i]);
    for (int i=1;i<=b;i++){
        for (int j=1;j<=a;j++){
            if (d[i]==c[j]){
                cout<<i<<endl;
                m++;
                d[i]=d[i-1];
                }
        }
        if (m==0)
            cout<<"-1"<<endl;
        m=0;
    }
    return 0;
}

蒟蒻的代码