PrStack

#include <iostream>
#include <fstream>
#include <stack>
#include <string>

using namespace std;

int main (void)
{
    ifstream in ("input.txt");
    ofstream out ("output.txt");

    stack <char> s1;

    string s_s1 = "";
    string s_s2 = "";

    getline(in, s_s1);
    getline(in, s_s2);

    for (int i = 0; i < s_s1.length(); i++)
        s1.push(s_s1[i]);

    char c;
    bool isOk = true;

    if (s1.size() != s_s2.length())
        isOk = false;
    else
    {
        for (int i = 0; i < s_s2.length(); i++)
        {
            c = s1.top();
            s1.pop();
            if (c != s_s2[i])
            {
                isOk = false;
                break;
            }
        }
    }
    if (isOk) out << "Yes" << endl;
    else out << "No" << endl;
}