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https://www.nowcoder.com/practice/069e2130430c41229ab25e47fa0949a6
//KY157 找x
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
using namespace std;
int n, x;
int main()
{
while(cin>>n)
{
vector<int>v(n);
for(int i=0;i<n;i++) cin>>v[i];
cin>>x;
vector<int>::iterator it;
it=find(v.begin(), v.end(),x);
if(it==v.end()) cout<<-1<<"\n";
else cout<<it-v.begin()<<"\n";
}
return 0;
}
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