#include <iostream>
#include <time.h>
using namespace std;
int fillArr(int *a, int n) {
for (int i = 0; i<n; i++)
cin >> a[i];
return 0;
}
int fillRandArr(int *a, int n) {
for (int i = 0; i<n; i++)
a[i] = rand()%100;
return 0;
}
int printArr(int *a, int n) {
for (int i = 0; i<n; i++)
cout << a[i] << " ";
return 0;
}
int findArr(int *a, int n, int key) {
int c = -1;
for (int i = 0; i<n; i++)
if (a[i]==key)
c = i;
return c;
}
int main()
{
srand(time(0));
int n;
int arr[100];
cin >> n;
fillRandArr(arr, n);
printArr(arr, n);
cout << "key = " << findArr(arr, n, 10);
}