C++,luogu,P11679 [Algo Beat Contest 001 A] Animal Beheaded

//luogu,P11679 [Algo Beat Contest 001 A] Animal Beheaded
#include <string>
#include <iostream>
int main(){
    int a;std::cin>>a;
    std::string str;
    std::cin>>str;
    int len = a/3;
    std::cout<<str.substr(len,len)<<str.substr(0,len)<<str.substr(2*len,len)<<std::endl;
}