#include <iostream>
#include <string>
using namespace std;

int main(){
    string str;
    while(1){
        cout << "Implements echo program\n";
        cout << "If you want exit, Input \"exit\" : ";
        cin >> str;
        if(str == "exit"){
            exit(100);
        }
        else cout << "Output >> " << str << endl;
    }
    return 0;
}