@@ -0,0 +1,17 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+int main() {
+ vector<int> v(10);
+ for (size_t i = 0; i < v.size(); i++)cin >> v[i];
+ int k;
+ cin >> k;
+ vector<int>::iterator it = find(v.begin(), v.end(), k);
+ if (it == v.end()) {
+ cout << "Not exist!" << endl;
+ } else {
+ cout << it - v.begin() << endl;
+ }
+ return 0;
+}