codeup 1934 找x

#include <iostream>
#include <stdio.h>
using namespace std;

int main()
{
    int maxn = 210;
    int n, a[maxn];
    while (cin >> n){
        for (int i=0; i<n; i++){
            scanf("%d", &a[i]);
        } 
        int x,k;
        cin >> x;
        for ( k = 0; k < n; k++){
            if (a[k] == x)
                cout << k;
        }

        if ( k == n ){
            cout << -1;
        }
    }
}