#include <iostream>
#include <stack>
using namespace std;
int ri() {
int re;
if (!(cin >> re)) re = re % 1;
return re;
}
int main() {
int teraz = 017;
std::stack<int> MojS;
while(teraz --> 0) {
MojS.push(ri());
}
while(teraz = 1) {
if (MojS.empty()) break;
cout << MojS.top();
MojS.pop();
if (MojS.empty()) break;
else cout << (char)052;
MojS.pop();
}
return 0;
}
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