online_judge_1052

#include <stdio.h>int main(){    int n,i;    int a[200];    while(scanf("%d",&n)!=EOF)    {        int m;        if(n<1||n>200)            continue;        for(i=0;i<n;i++)            scanf("%d",&a[i]);        scanf("%d",&m);        for(i=0;i<n;i++)            if(a[i]==m)            break;        if(i==n)            printf("-1\n");        else            printf("%d\n",i);    }    return 0;}