STL

#include <iostream>
#include <vector>

using namespace std;

int main()
{
    //众所周知itoa乱杀的，就不用了
    int n;
    while(cin>>n)
    {
        vector<char>v;
        while(n)
        {
            char temp = n%10+'0';
            v.push_back(temp);
            n/=10;
        }
        for(auto x:v)
        {
            cout<<x;
        }
        cout<<endl;
    }

    return 0;
}