#include 
    
     #include 
     
      using namespace std;int s[1000010], p[10010];int next[10010];int m, n, ans, t;void getnext(){    int i, j;    next[1]=0;    j=0;    i=1;    while(i
      
       m)        return i-m;    else        return -1;}int main(){    //freopen("in", "r", stdin);    //freopen("out", "w", stdout);    cin>>t;    while(t--){        scanf("%d %d", &n, &m);        for(int i=1; i<=n; i++){            scanf("%d", &s[i]);        }            for(int i=1; i<=m; i++){            scanf("%d", &p[i]);         }        getnext();        ans=kmp();        cout<
       
        <