#include<iostream>
using namespace std;
int main() {
    int height;
    cin>>height;
    if(height<1||height>26) {
        cout<<"Invalid input"<<endl;
        return 0;
        for(int i=1;i<=height;++i) {
            for(int j=0;j<1;++j);
        }
        cout<<endl;
    }
    return 0;