include<iostream>

include<cmath>

using namespace std; class Demo{ private: int n; public: void setNum(int n){ this->n=n; } int getNum(){ return n; } }; int main(){ Demo d; int n; cin>>n; d.setNum(n); int n2=d.getNum()/10; int n3=d.getNum()%10; cout<<n3<<n2;

}